Step 00 — Squelette + intégration naïve

3 Bounded Contexts (Sales, Invoicing, LegacyFulfillment) avec : - Domaines complets (agrégats, VOs, événements, invariants) - Couche application (commands, queries, ports) - Infrastructure in-memory (repos, gateway fake) - Controllers HTTP Symfony - Couplage naïf synchrone entre BC via NaiveSalesEventPublisher - 20 tests unitaires et d'intégration passants
2026-03-04 00:27:15 +01:00
commit a4a14e441b
86 changed files with 7059 additions and 0 deletions
--- a/.env
+++ b/.env
@@ -0,0 +1,3 @@
+APP_ENV=dev
+APP_DEBUG=1
+APP_SECRET=minishop-boilerplate-change-me
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,5 @@
+/vendor/
+/apps/symfony/var/
+/.env.local
+/.phpunit.cache/
+/.phpunit.result.cache
--- a/README.md
+++ b/README.md
@@ -0,0 +1,23 @@
+# DDDBoilerplate - MiniShop
+
+Boilerplate DDD minimaliste pour tutoriels Blue Book, pense pour PHP/Symfony et transposable.
+
+Document de reference:
+
+- [docs/MINISHOP_DDD_BLUEBOOK_BOILERPLATE.md](docs/MINISHOP_DDD_BLUEBOOK_BOILERPLATE.md)
+
+Patterns cibles:
+
+- OHS
+- ACL
+- Conformist
+- Published Language
+
+Progression recommandee via tags Git:
+
+- `step/00-naive`
+- `step/01-published-language`
+- `step/02-conformist`
+- `step/03-acl`
+- `step/04-ohs`
+- `step/05-hardening`
--- a/apps/symfony/config/packages/framework.yaml
+++ b/apps/symfony/config/packages/framework.yaml
@@ -0,0 +1,11 @@
+framework:
+    secret: '%env(APP_SECRET)%'
+    test: ~
+    http_method_override: false
+    handle_all_throwables: true
+    php_errors:
+        log: true
+
+when@test:
+    framework:
+        test: true
--- a/apps/symfony/config/routes.yaml
+++ b/apps/symfony/config/routes.yaml
@@ -0,0 +1,5 @@
+controllers:
+    resource:
+        path: ../../../src/
+        namespace: MiniShop
+    type: attribute
--- a/apps/symfony/config/services.yaml
+++ b/apps/symfony/config/services.yaml
@@ -0,0 +1,62 @@
+services:
+    _defaults:
+        autowire: true
+        autoconfigure: true
+
+    # --- Shared ---
+    MiniShop\Shared\:
+        resource: '%kernel.project_dir%/src/Shared/'
+
+    MiniShop\Shared\Technical\Clock:
+        alias: MiniShop\Shared\Technical\SystemClock
+
+    # --- Sales ---
+    MiniShop\Sales\Application\:
+        resource: '%kernel.project_dir%/src/Sales/Application/'
+
+    MiniShop\Sales\Infrastructure\:
+        resource: '%kernel.project_dir%/src/Sales/Infrastructure/'
+
+    MiniShop\Sales\Interfaces\:
+        resource: '%kernel.project_dir%/src/Sales/Interfaces/'
+        tags: ['controller.service_arguments']
+
+    MiniShop\Sales\Application\Port\OrderRepository:
+        alias: MiniShop\Sales\Infrastructure\Persistence\InMemoryOrderRepository
+
+    MiniShop\Sales\Application\Port\SalesEventPublisher:
+        alias: MiniShop\Sales\Infrastructure\Messaging\NaiveSalesEventPublisher
+
+    # --- Invoicing ---
+    MiniShop\Invoicing\Application\:
+        resource: '%kernel.project_dir%/src/Invoicing/Application/'
+
+    MiniShop\Invoicing\Infrastructure\:
+        resource: '%kernel.project_dir%/src/Invoicing/Infrastructure/'
+
+    MiniShop\Invoicing\Interfaces\:
+        resource: '%kernel.project_dir%/src/Invoicing/Interfaces/'
+        tags: ['controller.service_arguments']
+
+    MiniShop\Invoicing\Application\Port\InvoiceRepository:
+        alias: MiniShop\Invoicing\Infrastructure\Persistence\InMemoryInvoiceRepository
+
+    MiniShop\Invoicing\Application\Port\InvoiceNumberGenerator:
+        alias: MiniShop\Invoicing\Infrastructure\SequentialInvoiceNumberGenerator
+
+    # --- LegacyFulfillment ---
+    MiniShop\LegacyFulfillment\Application\:
+        resource: '%kernel.project_dir%/src/LegacyFulfillment/Application/'
+
+    MiniShop\LegacyFulfillment\Infrastructure\:
+        resource: '%kernel.project_dir%/src/LegacyFulfillment/Infrastructure/'
+
+    MiniShop\LegacyFulfillment\Interfaces\:
+        resource: '%kernel.project_dir%/src/LegacyFulfillment/Interfaces/'
+        tags: ['controller.service_arguments']
+
+    MiniShop\LegacyFulfillment\Application\Port\ShipmentRequestRepository:
+        alias: MiniShop\LegacyFulfillment\Infrastructure\Persistence\InMemoryShipmentRequestRepository
+
+    MiniShop\LegacyFulfillment\Application\Port\LegacyFulfillmentGateway:
+        alias: MiniShop\LegacyFulfillment\Infrastructure\Gateway\FakeLegacyFulfillmentGateway
--- a/apps/symfony/public/index.php
+++ b/apps/symfony/public/index.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Kernel;
+use Symfony\Component\Dotenv\Dotenv;
+use Symfony\Component\HttpFoundation\Request;
+
+require_once dirname(__DIR__, 3) . '/vendor/autoload.php';
+
+(new Dotenv())->bootEnv(dirname(__DIR__, 3) . '/.env');
+
+$kernel = new Kernel($_SERVER['APP_ENV'] ?? 'dev', (bool) ($_SERVER['APP_DEBUG'] ?? true));
+$request = Request::createFromGlobals();
+$response = $kernel->handle($request);
+$response->send();
+$kernel->terminate($request, $response);
--- a/apps/symfony/src/Kernel.php
+++ b/apps/symfony/src/Kernel.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App;
+
+use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
+use Symfony\Component\HttpKernel\Kernel as BaseKernel;
+
+final class Kernel extends BaseKernel
+{
+    use MicroKernelTrait;
+
+    public function getConfigDir(): string
+    {
+        return $this->getProjectDir() . '/apps/symfony/config';
+    }
+
+    public function getCacheDir(): string
+    {
+        return $this->getProjectDir() . '/apps/symfony/var/cache/' . $this->environment;
+    }
+
+    public function getLogDir(): string
+    {
+        return $this->getProjectDir() . '/apps/symfony/var/log';
+    }
+}
--- a/bin/console
+++ b/bin/console
@@ -0,0 +1,21 @@
+#!/usr/bin/env php
+<?php
+
+declare(strict_types=1);
+
+use App\Kernel;
+use Symfony\Bundle\FrameworkBundle\Console\Application;
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Dotenv\Dotenv;
+
+require dirname(__DIR__) . '/vendor/autoload.php';
+
+(new Dotenv())->bootEnv(dirname(__DIR__) . '/.env');
+
+$input = new ArgvInput();
+$env = $input->getParameterOption(['--env', '-e'], $_SERVER['APP_ENV'] ?? 'dev', true);
+$debug = (bool) ($_SERVER['APP_DEBUG'] ?? ($env !== 'prod'));
+
+$kernel = new Kernel($env, $debug);
+$application = new Application($kernel);
+$application->run($input);
--- a/composer.json
+++ b/composer.json
@@ -0,0 +1,34 @@
+{
+    "name": "roukmoute/ddd-boilerplate",
+    "description": "MiniShop - DDD Blue Book Boilerplate",
+    "type": "project",
+    "license": "MIT",
+    "require": {
+        "php": ">=8.5",
+        "symfony/framework-bundle": "^7.2",
+        "symfony/console": "^7.2",
+        "symfony/dotenv": "^7.2",
+        "symfony/yaml": "^7.2"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^11.5"
+    },
+    "autoload": {
+        "psr-4": {
+            "MiniShop\\Sales\\": "src/Sales/",
+            "MiniShop\\Invoicing\\": "src/Invoicing/",
+            "MiniShop\\LegacyFulfillment\\": "src/LegacyFulfillment/",
+            "MiniShop\\Shared\\": "src/Shared/",
+            "MiniShop\\Contracts\\": "contracts/",
+            "App\\": "apps/symfony/src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "MiniShop\\Tests\\": "tests/"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    }
+}
--- a/composer.lock
+++ b/composer.lock
--- a/docs/MINISHOP_DDD_BLUEBOOK_BOILERPLATE.md
+++ b/docs/MINISHOP_DDD_BLUEBOOK_BOILERPLATE.md
@@ -0,0 +1,404 @@
+# MiniShop DDD Blue Book Boilerplate
+
+Document de reference pour un boilerplate DDD minimaliste, pense pour PHP/Symfony, mais transposable.
+
+## 1. But du boilerplate
+
+Construire une base unique, reutilisable pour des tutoriels progressifs sur les patterns du Blue Book:
+
+- `OHS` (Open Host Service)
+- `ACL` (Anti-Corruption Layer)
+- `Conformist`
+- `Published Language`
+
+Contraintes voulues:
+
+- un seul repo
+- `2 a 3 Bounded Contexts` maximum
+- interfaces explicites entre contextes
+- integration volontairement naive au debut
+- evolution pas a pas, concept par concept
+
+## 2. Positionnement et principes
+
+Ce boilerplate privilegie la purete tactique/strategique du DDD, pas la sophistication technique.
+
+Principes directeurs:
+
+1. Un `Bounded Context` = un modele autonome + un langage propre.
+2. Aucune entite/VO partagee entre BC par defaut.
+3. Les relations entre BC sont explicites via une `Context Map`.
+4. Le code inter-BC passe par des contrats (DTO, messages, API), jamais par les modeles internes.
+5. Tout pattern (Conformist, ACL, OHS, Published Language) est rendu visible dans l'arborescence et dans les tests.
+6. Les choix techniques Symfony/Doctrine restent remplaçables.
+
+## 3. Domaine MiniShop (scope minimal)
+
+### 3.1 Bounded Contexts retenus
+
+- `Sales` (coeur metier): prise de commande
+- `Invoicing`: emission de facture
+- `LegacyFulfillment`: expedition via systeme legacy volontairement "sale"
+
+`Shipping` peut remplacer `LegacyFulfillment` dans une variante "moderne", mais la version pedagogique recommande `LegacyFulfillment` pour illustrer `ACL`.
+
+### 3.2 Scenario fil rouge
+
+1. Un client passe une commande dans `Sales`.
+2. `Sales` notifie les autres BC qu'une commande est confirmee.
+3. `Invoicing` produit une facture.
+4. `LegacyFulfillment` cree une demande d'expedition dans un format legacy.
+
+## 4. Ubiquitous Language par BC
+
+### 4.1 Sales
+
+- Entites/Aggregats: `Order`
+- Value Objects: `OrderId`, `CustomerId`, `Money`, `OrderLine`
+- Evenements de domaine: `OrderPlaced`, `OrderConfirmed`
+- Invariants:
+  - une commande a au moins une ligne
+  - total > 0
+  - confirmation impossible si commande vide
+
+### 4.2 Invoicing
+
+- Entites/Aggregats: `Invoice`
+- Value Objects: `InvoiceId`, `BillingParty`, `InvoiceLine`, `TaxRate`
+- Evenements de domaine: `InvoiceIssued`
+- Invariants:
+  - une facture refere une commande externe
+  - montant facture coherent avec ses lignes
+
+### 4.3 LegacyFulfillment
+
+- Entites/Aggregats: `ShipmentRequest`
+- Value Objects: `LegacyOrderRef`, `ShippingAddress`, `ParcelSpec`
+- Evenements de domaine: `ShipmentRequested`
+- Contraintes:
+  - format legacy impose (champs abrégés, codifications date/status)
+  - mapping explicite depuis le langage publie
+
+## 5. Context Map cible (pedagogique)
+
+Etat initial (naif):
+
+- `Sales` appelle directement des services applicatifs externes
+- schemas ad hoc, non versionnes
+- couplage fort et fragile
+
+Etat cible (apres tutoriels):
+
+- `Sales` expose un `OHS` pour consultation/commande (option REST ou message)
+- `Sales` publie un `Published Language` versionne (`sales.v1`)
+- `Invoicing` suit `Conformist` sur ce langage publie
+- `LegacyFulfillment` introduit un `ACL` entre langage publie et modele legacy
+
+Representation synthese:
+
+```text
+Sales (Upstream)
+  ├── Published Language (sales.v1.*)
+  ├── OHS (query/command API)
+  ├──> Invoicing (Conformist)
+  └──> LegacyFulfillment (ACL)
+```
+
+## 6. Architecture de code recommandee
+
+```text
+.
+├── apps/
+│   └── symfony/
+│       ├── config/
+│       └── public/
+├── src/
+│   ├── Sales/
+│   │   ├── Domain/
+│   │   ├── Application/
+│   │   ├── Infrastructure/
+│   │   └── Interfaces/
+│   ├── Invoicing/
+│   │   ├── Domain/
+│   │   ├── Application/
+│   │   ├── Infrastructure/
+│   │   └── Interfaces/
+│   ├── LegacyFulfillment/
+│   │   ├── Domain/
+│   │   ├── Application/
+│   │   ├── Infrastructure/
+│   │   └── Interfaces/
+│   └── Shared/
+│       └── Technical/      # utilitaires purement techniques (Clock, UUID)
+├── contracts/
+│   └── sales/
+│       └── v1/
+│           ├── Event/
+│           └── Api/
+├── tests/
+│   ├── Unit/
+│   ├── Integration/
+│   └── Contract/
+└── docs/
+    ├── MINISHOP_DDD_BLUEBOOK_BOILERPLATE.md
+    └── tutorials/
+```
+
+Regle stricte:
+
+- `src/Shared` ne contient aucun concept metier transverse.
+- tout objet dans `contracts/` est stable, versionnable et "publique" entre BC.
+
+## 7. Convention de couches par BC
+
+- `Domain`:
+  - modeles metier, invariants, services de domaine, evenements de domaine
+  - aucune dependance framework
+- `Application`:
+  - use cases (commands/queries), orchestration, ports (interfaces)
+- `Infrastructure`:
+  - persistance, bus, clients HTTP, adaptateurs externes
+- `Interfaces`:
+  - HTTP CLI Messenger, serializers, controleurs
+
+## 8. Contrats inter-BC (Published Language)
+
+Le contrat publie minimal recommande:
+
+- `contracts/sales/v1/Event/OrderPlaced.php`
+- `contracts/sales/v1/Event/OrderConfirmed.php`
+- `contracts/sales/v1/Api/OrderView.php`
+
+Regles:
+
+1. Contrats immutables.
+2. Version explicite (`v1`, puis `v2`).
+3. Compatibilite retro geree par ajout, pas mutation destructive.
+4. Tests de contrat obligatoires (`tests/Contract`).
+
+## 9. Evolution tutorielle (roadmap)
+
+### Episode 00 - Squelette + integration naive
+
+- BC en place
+- workflow `PlaceOrder -> Invoice -> LegacyShipment`
+- appels synchrones directs inter-BC
+- aucun Published Language officiel
+
+Tag Git: `step/00-naive`
+
+### Episode 01 - Published Language
+
+- extraction des DTO publics dans `contracts/sales/v1`
+- premiere version de messages d'integration
+- tests de schema/serialisation
+
+Tag Git: `step/01-published-language`
+
+### Episode 02 - Conformist (Invoicing)
+
+- `Invoicing` consomme tel quel `sales.v1`
+- documentation explicite de la dependance upstream
+- tests de non-regression de compatibilite
+
+Tag Git: `step/02-conformist`
+
+### Episode 03 - ACL (LegacyFulfillment)
+
+- creation d'une couche `AntiCorruption` cote `LegacyFulfillment`
+- mapping `sales.v1 -> legacy command model`
+- isolation des bizarreries legacy dans l'ACL
+
+Tag Git: `step/03-acl`
+
+### Episode 04 - OHS (Sales)
+
+- exposition d'un service hote explicite (`/api/sales/v1/...` ou endpoint message)
+- documentation des points d'entree supportes
+- modeles internes toujours non exposes
+
+Tag Git: `step/04-ohs`
+
+### Episode 05 - Hardening
+
+- outbox/event relay (optionnel selon niveau tuto)
+- idempotence des consommateurs
+- monitoring minimal (logs de correlation)
+
+Tag Git: `step/05-hardening`
+
+## 10. Definition of Done par episode
+
+Chaque episode doit fournir:
+
+1. code compilable et testable
+2. diagramme context map a jour (`docs/tutorials/`)
+3. note "ce qui change" + "pourquoi Blue Book"
+4. tag git pour reset rapide
+
+## 11. Strategie de reset pour les tutos
+
+Approche recommandee:
+
+- une branche `main` stable (etat final ou etat de base choisi)
+- des tags immuables `step/xx-*`
+- une branche de travail recreee a chaque tuto depuis le tag
+
+Exemple:
+
+```bash
+git fetch --tags
+git switch -C play/episode-03 step/03-acl
+```
+
+## 12. Regles de purete Blue Book (checklist)
+
+- Le modele de domaine de chaque BC est independant des autres BC.
+- La relation upstream/downstream est documentee.
+- Les dependances de code suivent la context map, pas l'inverse.
+- Les traductions de langage sont localisees (ACL), jamais diffuses partout.
+- Les contrats publies sont versionnes et testes.
+- Les cas d'usage ne contournent pas les invariants d'agregat.
+
+## 13. Gabarits minimaux utiles (pseudo-code)
+
+### 13.1 Port de publication d'evenement (Application)
+
+```php
+interface SalesEventPublisher
+{
+    public function publishOrderConfirmed(OrderConfirmedMessage $message): void;
+}
+```
+
+### 13.2 ACL vers legacy (Infrastructure)
+
+```php
+final class LegacyShipmentAcl
+{
+    public function fromSalesOrderConfirmed(OrderConfirmedMessage $message): LegacyCreateShipmentCommand
+    {
+        // Mapping explicite du langage publie vers le modele legacy.
+    }
+}
+```
+
+### 13.3 Use case de Sales (Application)
+
+```php
+final class ConfirmOrderHandler
+{
+    public function __invoke(ConfirmOrderCommand $command): void
+    {
+        // Charge l'agregat, applique l'invariant, persiste, publie l'evenement d'integration.
+    }
+}
+```
+
+## 14. Decoupage recommande des tests
+
+- `tests/Unit/Sales/Domain/*`: invariants d'agregat
+- `tests/Unit/Invoicing/Domain/*`: regles de facturation
+- `tests/Unit/LegacyFulfillment/Infrastructure/AntiCorruption/*`: mapping ACL
+- `tests/Contract/Sales/v1/*`: stabilite du langage publie
+- `tests/Integration/*`: wiring Symfony, bus, persistence
+
+## 15. Ce que ce boilerplate n'essaie pas de faire
+
+- couvrir tous les patterns strategiques DDD d'un coup
+- fournir une architecture microservices complete
+- optimiser prematurement la performance
+
+La priorite est la clarte pedagogique, la reproductibilite et la fidelite Blue Book.
+
+## 16. Specification minimale "codegen-ready"
+
+### 16.1 Sales - cas d'usage
+
+Commandes:
+
+- `PlaceOrder`
+- `ConfirmOrder`
+- `CancelOrder`
+
+Queries:
+
+- `GetOrderById`
+- `ListOrdersByCustomer`
+
+Ports sortants:
+
+- `OrderRepository`
+- `SalesEventPublisher`
+- `Clock`
+- `TransactionManager`
+
+Evenements d'integration publies:
+
+- `sales.v1.OrderPlaced`
+- `sales.v1.OrderConfirmed`
+- `sales.v1.OrderCancelled`
+
+### 16.2 Invoicing - cas d'usage
+
+Commandes:
+
+- `IssueInvoiceForExternalOrder`
+- `MarkInvoiceAsSent`
+
+Queries:
+
+- `GetInvoiceByOrderRef`
+
+Ports sortants:
+
+- `InvoiceRepository`
+- `InvoiceNumberGenerator`
+
+Evenements d'integration consommes:
+
+- `sales.v1.OrderConfirmed` (Conformist)
+
+### 16.3 LegacyFulfillment - cas d'usage
+
+Commandes:
+
+- `RequestShipmentFromSalesOrder`
+- `MarkShipmentDispatched`
+
+Queries:
+
+- `GetShipmentByExternalOrderRef`
+
+Ports sortants:
+
+- `ShipmentRequestRepository`
+- `LegacyFulfillmentGateway`
+
+Evenements d'integration consommes:
+
+- `sales.v1.OrderConfirmed` (via ACL)
+
+## 17. Matrice d'integration inter-BC
+
+| Producteur | Contrat | Consommateur | Pattern | Notes |
+|---|---|---|---|---|
+| Sales | `sales.v1.OrderPlaced` | (optionnel) Invoicing | Published Language | Peut etre ignore en phase initiale |
+| Sales | `sales.v1.OrderConfirmed` | Invoicing | Conformist | Invoicing s'aligne sur le schema upstream |
+| Sales | `sales.v1.OrderConfirmed` | LegacyFulfillment | ACL | Traduction vers format legacy |
+| Sales | `sales.v1 API` | clients externes | OHS | API stable et versionnee |
+
+## 18. Plan d'implementation concret (ordre recommande)
+
+1. Implementer le domaine `Sales` (aggregate `Order`, invariants, repository in-memory).
+2. Ajouter use case `PlaceOrder`, puis `ConfirmOrder`.
+3. Brancher `Invoicing` en appel direct naif (episode 00).
+4. Introduire `contracts/sales/v1` et migrer les echanges (episode 01).
+5. Formaliser `Invoicing` en Conformist avec tests de contrat (episode 02).
+6. Introduire `LegacyFulfillment` ACL et isoler tout mapping legacy (episode 03).
+7. Exposer `Sales` via OHS versionne (episode 04).
+8. Ajouter robustesse (idempotence, outbox optionnelle, correlation-id) (episode 05).
+
+---
+
+Ce document sert de "constitution" du repo MiniShop. Toute evolution de structure doit justifier son impact sur la context map et sur les patterns pedagogiques cibles.
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         failOnRisky="true"
+         failOnWarning="true"
+>
+    <php>
+        <ini name="display_errors" value="1"/>
+        <ini name="error_reporting" value="-1"/>
+        <server name="APP_ENV" value="test" force="true"/>
+        <server name="APP_DEBUG" value="1" force="true"/>
+        <server name="APP_SECRET" value="test-secret"/>
+        <server name="KERNEL_CLASS" value="App\Kernel"/>
+    </php>
+    <testsuites>
+        <testsuite name="Unit">
+            <directory>tests/Unit</directory>
+        </testsuite>
+        <testsuite name="Integration">
+            <directory>tests/Integration</directory>
+        </testsuite>
+        <testsuite name="Contract">
+            <directory>tests/Contract</directory>
+        </testsuite>
+    </testsuites>
+    <source>
+        <include>
+            <directory>src</directory>
+            <directory>contracts</directory>
+        </include>
+    </source>
+</phpunit>
--- a/src/Invoicing/Application/Command/IssueInvoiceForExternalOrder.php
+++ b/src/Invoicing/Application/Command/IssueInvoiceForExternalOrder.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Application\Command;
+
+final readonly class IssueInvoiceForExternalOrder
+{
+    /**
+     * @param list<array{description: string, quantity: int, unitPriceInCents: int, currency: string}> $lines
+     */
+    public function __construct(
+        public string $externalOrderId,
+        public string $customerName,
+        public string $customerAddress,
+        public array $lines,
+    ) {}
+}
--- a/src/Invoicing/Application/Command/IssueInvoiceForExternalOrderHandler.php
+++ b/src/Invoicing/Application/Command/IssueInvoiceForExternalOrderHandler.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Application\Command;
+
+use MiniShop\Invoicing\Application\Port\InvoiceNumberGenerator;
+use MiniShop\Invoicing\Application\Port\InvoiceRepository;
+use MiniShop\Invoicing\Domain\Model\BillingParty;
+use MiniShop\Invoicing\Domain\Model\Invoice;
+use MiniShop\Invoicing\Domain\Model\InvoiceId;
+use MiniShop\Invoicing\Domain\Model\InvoiceLine;
+use MiniShop\Invoicing\Domain\Model\TaxRate;
+use MiniShop\Shared\Technical\Clock;
+use MiniShop\Shared\Technical\UuidGenerator;
+
+final readonly class IssueInvoiceForExternalOrderHandler
+{
+    public function __construct(
+        private InvoiceRepository $invoiceRepository,
+        private InvoiceNumberGenerator $invoiceNumberGenerator,
+        private Clock $clock,
+    ) {}
+
+    public function __invoke(IssueInvoiceForExternalOrder $command): void
+    {
+        $lines = array_map(
+            static fn (array $line): InvoiceLine => new InvoiceLine(
+                $line['description'],
+                $line['quantity'],
+                $line['unitPriceInCents'],
+                $line['currency'],
+                TaxRate::standard(),
+            ),
+            $command->lines,
+        );
+
+        $invoice = Invoice::issueForExternalOrder(
+            InvoiceId::fromString(UuidGenerator::generate()),
+            $this->invoiceNumberGenerator->next(),
+            $command->externalOrderId,
+            new BillingParty($command->customerName, $command->customerAddress),
+            $lines,
+            $this->clock->now(),
+        );
+
+        $this->invoiceRepository->save($invoice);
+    }
+}
--- a/src/Invoicing/Application/Command/MarkInvoiceAsSent.php
+++ b/src/Invoicing/Application/Command/MarkInvoiceAsSent.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Application\Command;
+
+final readonly class MarkInvoiceAsSent
+{
+    public function __construct(
+        public string $invoiceId,
+    ) {}
+}
--- a/src/Invoicing/Application/Command/MarkInvoiceAsSentHandler.php
+++ b/src/Invoicing/Application/Command/MarkInvoiceAsSentHandler.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Application\Command;
+
+use MiniShop\Invoicing\Application\Port\InvoiceRepository;
+use MiniShop\Invoicing\Domain\Model\InvoiceId;
+
+final readonly class MarkInvoiceAsSentHandler
+{
+    public function __construct(
+        private InvoiceRepository $invoiceRepository,
+    ) {}
+
+    public function __invoke(MarkInvoiceAsSent $command): void
+    {
+        $invoice = $this->invoiceRepository->get(InvoiceId::fromString($command->invoiceId));
+        $invoice->markAsSent();
+        $this->invoiceRepository->save($invoice);
+    }
+}
--- a/src/Invoicing/Application/Port/InvoiceNumberGenerator.php
+++ b/src/Invoicing/Application/Port/InvoiceNumberGenerator.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Application\Port;
+
+interface InvoiceNumberGenerator
+{
+    public function next(): string;
+}
--- a/src/Invoicing/Application/Port/InvoiceRepository.php
+++ b/src/Invoicing/Application/Port/InvoiceRepository.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Application\Port;
+
+use MiniShop\Invoicing\Domain\Model\Invoice;
+use MiniShop\Invoicing\Domain\Model\InvoiceId;
+
+interface InvoiceRepository
+{
+    public function save(Invoice $invoice): void;
+
+    public function get(InvoiceId $id): Invoice;
+
+    public function findByExternalOrderId(string $externalOrderId): ?Invoice;
+}
--- a/src/Invoicing/Application/Query/GetInvoiceByOrderRef.php
+++ b/src/Invoicing/Application/Query/GetInvoiceByOrderRef.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Application\Query;
+
+final readonly class GetInvoiceByOrderRef
+{
+    public function __construct(
+        public string $externalOrderId,
+    ) {}
+}
--- a/src/Invoicing/Application/Query/GetInvoiceByOrderRefHandler.php
+++ b/src/Invoicing/Application/Query/GetInvoiceByOrderRefHandler.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Application\Query;
+
+use MiniShop\Invoicing\Application\Port\InvoiceRepository;
+use MiniShop\Invoicing\Domain\Model\Invoice;
+
+final readonly class GetInvoiceByOrderRefHandler
+{
+    public function __construct(
+        private InvoiceRepository $invoiceRepository,
+    ) {}
+
+    public function __invoke(GetInvoiceByOrderRef $query): ?Invoice
+    {
+        return $this->invoiceRepository->findByExternalOrderId($query->externalOrderId);
+    }
+}
--- a/src/Invoicing/Domain/Event/InvoiceIssued.php
+++ b/src/Invoicing/Domain/Event/InvoiceIssued.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Domain\Event;
+
+use MiniShop\Invoicing\Domain\Model\InvoiceId;
+
+final readonly class InvoiceIssued
+{
+    public function __construct(
+        public InvoiceId $invoiceId,
+        public string $invoiceNumber,
+        public string $externalOrderId,
+        public int $totalInclTaxInCents,
+        public \DateTimeImmutable $issuedAt,
+    ) {}
+}
--- a/src/Invoicing/Domain/Model/BillingParty.php
+++ b/src/Invoicing/Domain/Model/BillingParty.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Domain\Model;
+
+final readonly class BillingParty
+{
+    public function __construct(
+        public string $name,
+        public string $address,
+    ) {}
+}
--- a/src/Invoicing/Domain/Model/Invoice.php
+++ b/src/Invoicing/Domain/Model/Invoice.php
@@ -0,0 +1,111 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Domain\Model;
+
+use MiniShop\Invoicing\Domain\Event\InvoiceIssued;
+
+final class Invoice
+{
+    private InvoiceStatus $status;
+    /** @var list<object> */
+    private array $domainEvents = [];
+
+    /**
+     * @param list<InvoiceLine> $lines
+     */
+    private function __construct(
+        public readonly InvoiceId $id,
+        public readonly string $invoiceNumber,
+        public readonly string $externalOrderId,
+        public readonly BillingParty $billingParty,
+        private readonly array $lines,
+        private readonly \DateTimeImmutable $issuedAt,
+    ) {
+        $this->status = InvoiceStatus::Issued;
+    }
+
+    /**
+     * @param list<InvoiceLine> $lines
+     */
+    public static function issueForExternalOrder(
+        InvoiceId $id,
+        string $invoiceNumber,
+        string $externalOrderId,
+        BillingParty $billingParty,
+        array $lines,
+        \DateTimeImmutable $issuedAt,
+    ): self {
+        if ($lines === []) {
+            throw new \DomainException('An invoice must have at least one line.');
+        }
+
+        $invoice = new self($id, $invoiceNumber, $externalOrderId, $billingParty, $lines, $issuedAt);
+
+        $invoice->recordEvent(new InvoiceIssued(
+            $id,
+            $invoiceNumber,
+            $externalOrderId,
+            $invoice->totalInclTax(),
+            $issuedAt,
+        ));
+
+        return $invoice;
+    }
+
+    public function markAsSent(): void
+    {
+        if ($this->status === InvoiceStatus::Sent) {
+            throw new \DomainException('Invoice is already sent.');
+        }
+
+        $this->status = InvoiceStatus::Sent;
+    }
+
+    public function totalExclTax(): int
+    {
+        return array_sum(array_map(
+            static fn (InvoiceLine $line): int => $line->lineTotalExclTax(),
+            $this->lines,
+        ));
+    }
+
+    public function totalInclTax(): int
+    {
+        return array_sum(array_map(
+            static fn (InvoiceLine $line): int => $line->lineTotalInclTax(),
+            $this->lines,
+        ));
+    }
+
+    public function status(): InvoiceStatus
+    {
+        return $this->status;
+    }
+
+    /** @return list<InvoiceLine> */
+    public function lines(): array
+    {
+        return $this->lines;
+    }
+
+    public function issuedAt(): \DateTimeImmutable
+    {
+        return $this->issuedAt;
+    }
+
+    /** @return list<object> */
+    public function releaseEvents(): array
+    {
+        $events = $this->domainEvents;
+        $this->domainEvents = [];
+
+        return $events;
+    }
+
+    private function recordEvent(object $event): void
+    {
+        $this->domainEvents[] = $event;
+    }
+}
--- a/src/Invoicing/Domain/Model/InvoiceId.php
+++ b/src/Invoicing/Domain/Model/InvoiceId.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Domain\Model;
+
+final readonly class InvoiceId
+{
+    private function __construct(public string $value) {}
+
+    public static function fromString(string $value): self
+    {
+        return new self($value);
+    }
+
+    public function toString(): string
+    {
+        return $this->value;
+    }
+
+    public function equals(self $other): bool
+    {
+        return $this->value === $other->value;
+    }
+}
--- a/src/Invoicing/Domain/Model/InvoiceLine.php
+++ b/src/Invoicing/Domain/Model/InvoiceLine.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Domain\Model;
+
+final readonly class InvoiceLine
+{
+    public function __construct(
+        public string $description,
+        public int $quantity,
+        public int $unitPriceInCents,
+        public string $currency,
+        public TaxRate $taxRate,
+    ) {
+        if ($quantity <= 0) {
+            throw new \InvalidArgumentException('Quantity must be positive.');
+        }
+    }
+
+    public function lineTotalExclTax(): int
+    {
+        return $this->quantity * $this->unitPriceInCents;
+    }
+
+    public function lineTotalInclTax(): int
+    {
+        return (int) round($this->lineTotalExclTax() * (1 + $this->taxRate->rate));
+    }
+}
--- a/src/Invoicing/Domain/Model/InvoiceStatus.php
+++ b/src/Invoicing/Domain/Model/InvoiceStatus.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Domain\Model;
+
+enum InvoiceStatus: string
+{
+    case Issued = 'issued';
+    case Sent = 'sent';
+}
--- a/src/Invoicing/Domain/Model/TaxRate.php
+++ b/src/Invoicing/Domain/Model/TaxRate.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Domain\Model;
+
+final readonly class TaxRate
+{
+    public function __construct(
+        public float $rate,
+        public string $label,
+    ) {
+        if ($rate < 0 || $rate > 1) {
+            throw new \InvalidArgumentException('Tax rate must be between 0 and 1.');
+        }
+    }
+
+    public static function standard(): self
+    {
+        return new self(0.20, 'TVA 20%');
+    }
+
+    public static function zero(): self
+    {
+        return new self(0.0, 'Exonere');
+    }
+}
--- a/src/Invoicing/Infrastructure/Persistence/InMemoryInvoiceRepository.php
+++ b/src/Invoicing/Infrastructure/Persistence/InMemoryInvoiceRepository.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Infrastructure\Persistence;
+
+use MiniShop\Invoicing\Application\Port\InvoiceRepository;
+use MiniShop\Invoicing\Domain\Model\Invoice;
+use MiniShop\Invoicing\Domain\Model\InvoiceId;
+
+final class InMemoryInvoiceRepository implements InvoiceRepository
+{
+    /** @var array<string, Invoice> */
+    private array $invoices = [];
+
+    public function save(Invoice $invoice): void
+    {
+        $this->invoices[$invoice->id->toString()] = $invoice;
+    }
+
+    public function get(InvoiceId $id): Invoice
+    {
+        return $this->invoices[$id->toString()]
+            ?? throw new \RuntimeException(sprintf('Invoice "%s" not found.', $id->toString()));
+    }
+
+    public function findByExternalOrderId(string $externalOrderId): ?Invoice
+    {
+        foreach ($this->invoices as $invoice) {
+            if ($invoice->externalOrderId === $externalOrderId) {
+                return $invoice;
+            }
+        }
+
+        return null;
+    }
+}
--- a/src/Invoicing/Infrastructure/SequentialInvoiceNumberGenerator.php
+++ b/src/Invoicing/Infrastructure/SequentialInvoiceNumberGenerator.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Infrastructure;
+
+use MiniShop\Invoicing\Application\Port\InvoiceNumberGenerator;
+
+final class SequentialInvoiceNumberGenerator implements InvoiceNumberGenerator
+{
+    private int $counter = 0;
+
+    public function next(): string
+    {
+        return sprintf('INV-%06d', ++$this->counter);
+    }
+}
--- a/src/Invoicing/Interfaces/Http/GetInvoiceController.php
+++ b/src/Invoicing/Interfaces/Http/GetInvoiceController.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Invoicing\Interfaces\Http;
+
+use MiniShop\Invoicing\Application\Query\GetInvoiceByOrderRef;
+use MiniShop\Invoicing\Application\Query\GetInvoiceByOrderRefHandler;
+use MiniShop\Invoicing\Domain\Model\InvoiceLine;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/invoicing/orders/{externalOrderId}/invoice', name: 'invoicing_get_invoice', methods: ['GET'])]
+final readonly class GetInvoiceController
+{
+    public function __construct(
+        private GetInvoiceByOrderRefHandler $handler,
+    ) {}
+
+    public function __invoke(string $externalOrderId): JsonResponse
+    {
+        $invoice = ($this->handler)(new GetInvoiceByOrderRef($externalOrderId));
+
+        if ($invoice === null) {
+            return new JsonResponse(['error' => 'Invoice not found.'], Response::HTTP_NOT_FOUND);
+        }
+
+        return new JsonResponse([
+            'invoiceId' => $invoice->id->toString(),
+            'invoiceNumber' => $invoice->invoiceNumber,
+            'externalOrderId' => $invoice->externalOrderId,
+            'billingParty' => [
+                'name' => $invoice->billingParty->name,
+                'address' => $invoice->billingParty->address,
+            ],
+            'status' => $invoice->status()->value,
+            'totalExclTax' => $invoice->totalExclTax(),
+            'totalInclTax' => $invoice->totalInclTax(),
+            'lines' => array_map(
+                static fn (InvoiceLine $line): array => [
+                    'description' => $line->description,
+                    'quantity' => $line->quantity,
+                    'unitPriceInCents' => $line->unitPriceInCents,
+                    'lineTotalExclTax' => $line->lineTotalExclTax(),
+                    'lineTotalInclTax' => $line->lineTotalInclTax(),
+                ],
+                $invoice->lines(),
+            ),
+        ]);
+    }
+}
--- a/src/LegacyFulfillment/Application/Command/MarkShipmentDispatched.php
+++ b/src/LegacyFulfillment/Application/Command/MarkShipmentDispatched.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Application\Command;
+
+final readonly class MarkShipmentDispatched
+{
+    public function __construct(
+        public string $externalOrderId,
+    ) {}
+}
--- a/src/LegacyFulfillment/Application/Command/MarkShipmentDispatchedHandler.php
+++ b/src/LegacyFulfillment/Application/Command/MarkShipmentDispatchedHandler.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Application\Command;
+
+use MiniShop\LegacyFulfillment\Application\Port\ShipmentRequestRepository;
+use MiniShop\LegacyFulfillment\Domain\Model\LegacyOrderRef;
+
+final readonly class MarkShipmentDispatchedHandler
+{
+    public function __construct(
+        private ShipmentRequestRepository $shipmentRequestRepository,
+    ) {}
+
+    public function __invoke(MarkShipmentDispatched $command): void
+    {
+        $ref = LegacyOrderRef::fromExternalId($command->externalOrderId);
+        $request = $this->shipmentRequestRepository->findByOrderRef($ref)
+            ?? throw new \RuntimeException(sprintf('Shipment for order "%s" not found.', $command->externalOrderId));
+
+        $request->markDispatched();
+        $this->shipmentRequestRepository->save($request);
+    }
+}
--- a/src/LegacyFulfillment/Application/Command/RequestShipmentFromSalesOrder.php
+++ b/src/LegacyFulfillment/Application/Command/RequestShipmentFromSalesOrder.php
@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Application\Command;
+
+final readonly class RequestShipmentFromSalesOrder
+{
+    public function __construct(
+        public string $externalOrderId,
+        public string $recipientName,
+        public string $street,
+        public string $city,
+        public string $postalCode,
+        public string $country,
+        public int $totalWeightInGrams,
+        public string $description,
+    ) {}
+}
--- a/src/LegacyFulfillment/Application/Command/RequestShipmentFromSalesOrderHandler.php
+++ b/src/LegacyFulfillment/Application/Command/RequestShipmentFromSalesOrderHandler.php
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Application\Command;
+
+use MiniShop\LegacyFulfillment\Application\Port\LegacyFulfillmentGateway;
+use MiniShop\LegacyFulfillment\Application\Port\ShipmentRequestRepository;
+use MiniShop\LegacyFulfillment\Domain\Model\LegacyOrderRef;
+use MiniShop\LegacyFulfillment\Domain\Model\ParcelSpec;
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentRequest;
+use MiniShop\LegacyFulfillment\Domain\Model\ShippingAddress;
+use MiniShop\Shared\Technical\Clock;
+
+final readonly class RequestShipmentFromSalesOrderHandler
+{
+    public function __construct(
+        private ShipmentRequestRepository $shipmentRequestRepository,
+        private LegacyFulfillmentGateway $gateway,
+        private Clock $clock,
+    ) {}
+
+    public function __invoke(RequestShipmentFromSalesOrder $command): void
+    {
+        $request = ShipmentRequest::fromSalesOrder(
+            LegacyOrderRef::fromExternalId($command->externalOrderId),
+            new ShippingAddress(
+                $command->recipientName,
+                $command->street,
+                $command->city,
+                $command->postalCode,
+                $command->country,
+            ),
+            new ParcelSpec($command->totalWeightInGrams, $command->description),
+            $this->clock->now(),
+        );
+
+        $this->shipmentRequestRepository->save($request);
+        $this->gateway->sendShipmentRequest($request);
+    }
+}
--- a/src/LegacyFulfillment/Application/Port/LegacyFulfillmentGateway.php
+++ b/src/LegacyFulfillment/Application/Port/LegacyFulfillmentGateway.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Application\Port;
+
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentRequest;
+
+interface LegacyFulfillmentGateway
+{
+    public function sendShipmentRequest(ShipmentRequest $request): void;
+}
--- a/src/LegacyFulfillment/Application/Port/ShipmentRequestRepository.php
+++ b/src/LegacyFulfillment/Application/Port/ShipmentRequestRepository.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Application\Port;
+
+use MiniShop\LegacyFulfillment\Domain\Model\LegacyOrderRef;
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentRequest;
+
+interface ShipmentRequestRepository
+{
+    public function save(ShipmentRequest $request): void;
+
+    public function findByOrderRef(LegacyOrderRef $orderRef): ?ShipmentRequest;
+}
--- a/src/LegacyFulfillment/Application/Query/GetShipmentByExternalOrderRef.php
+++ b/src/LegacyFulfillment/Application/Query/GetShipmentByExternalOrderRef.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Application\Query;
+
+final readonly class GetShipmentByExternalOrderRef
+{
+    public function __construct(
+        public string $externalOrderId,
+    ) {}
+}
--- a/src/LegacyFulfillment/Application/Query/GetShipmentByExternalOrderRefHandler.php
+++ b/src/LegacyFulfillment/Application/Query/GetShipmentByExternalOrderRefHandler.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Application\Query;
+
+use MiniShop\LegacyFulfillment\Application\Port\ShipmentRequestRepository;
+use MiniShop\LegacyFulfillment\Domain\Model\LegacyOrderRef;
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentRequest;
+
+final readonly class GetShipmentByExternalOrderRefHandler
+{
+    public function __construct(
+        private ShipmentRequestRepository $shipmentRequestRepository,
+    ) {}
+
+    public function __invoke(GetShipmentByExternalOrderRef $query): ?ShipmentRequest
+    {
+        return $this->shipmentRequestRepository->findByOrderRef(
+            LegacyOrderRef::fromExternalId($query->externalOrderId),
+        );
+    }
+}
--- a/src/LegacyFulfillment/Domain/Event/ShipmentRequested.php
+++ b/src/LegacyFulfillment/Domain/Event/ShipmentRequested.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Domain\Event;
+
+use MiniShop\LegacyFulfillment\Domain\Model\LegacyOrderRef;
+
+final readonly class ShipmentRequested
+{
+    public function __construct(
+        public LegacyOrderRef $orderRef,
+        public \DateTimeImmutable $requestedAt,
+    ) {}
+}
--- a/src/LegacyFulfillment/Domain/Model/LegacyOrderRef.php
+++ b/src/LegacyFulfillment/Domain/Model/LegacyOrderRef.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Domain\Model;
+
+final readonly class LegacyOrderRef
+{
+    private function __construct(public string $value) {}
+
+    public static function fromExternalId(string $externalId): self
+    {
+        return new self($externalId);
+    }
+
+    public function toString(): string
+    {
+        return $this->value;
+    }
+
+    public function equals(self $other): bool
+    {
+        return $this->value === $other->value;
+    }
+}
--- a/src/LegacyFulfillment/Domain/Model/ParcelSpec.php
+++ b/src/LegacyFulfillment/Domain/Model/ParcelSpec.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Domain\Model;
+
+final readonly class ParcelSpec
+{
+    public function __construct(
+        public int $weightInGrams,
+        public string $description,
+    ) {
+        if ($weightInGrams <= 0) {
+            throw new \InvalidArgumentException('Weight must be positive.');
+        }
+    }
+}
--- a/src/LegacyFulfillment/Domain/Model/ShipmentRequest.php
+++ b/src/LegacyFulfillment/Domain/Model/ShipmentRequest.php
@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Domain\Model;
+
+use MiniShop\LegacyFulfillment\Domain\Event\ShipmentRequested;
+
+final class ShipmentRequest
+{
+    private ShipmentStatus $status;
+    /** @var list<object> */
+    private array $domainEvents = [];
+
+    private function __construct(
+        public readonly LegacyOrderRef $orderRef,
+        public readonly ShippingAddress $address,
+        public readonly ParcelSpec $parcel,
+        private readonly \DateTimeImmutable $requestedAt,
+    ) {
+        $this->status = ShipmentStatus::Requested;
+    }
+
+    public static function fromSalesOrder(
+        LegacyOrderRef $orderRef,
+        ShippingAddress $address,
+        ParcelSpec $parcel,
+        \DateTimeImmutable $requestedAt,
+    ): self {
+        $request = new self($orderRef, $address, $parcel, $requestedAt);
+
+        $request->recordEvent(new ShipmentRequested($orderRef, $requestedAt));
+
+        return $request;
+    }
+
+    public function markDispatched(): void
+    {
+        if ($this->status === ShipmentStatus::Dispatched) {
+            throw new \DomainException('Shipment already dispatched.');
+        }
+
+        $this->status = ShipmentStatus::Dispatched;
+    }
+
+    public function status(): ShipmentStatus
+    {
+        return $this->status;
+    }
+
+    public function requestedAt(): \DateTimeImmutable
+    {
+        return $this->requestedAt;
+    }
+
+    /** @return list<object> */
+    public function releaseEvents(): array
+    {
+        $events = $this->domainEvents;
+        $this->domainEvents = [];
+
+        return $events;
+    }
+
+    private function recordEvent(object $event): void
+    {
+        $this->domainEvents[] = $event;
+    }
+}
--- a/src/LegacyFulfillment/Domain/Model/ShipmentStatus.php
+++ b/src/LegacyFulfillment/Domain/Model/ShipmentStatus.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Domain\Model;
+
+enum ShipmentStatus: string
+{
+    case Requested = 'requested';
+    case Dispatched = 'dispatched';
+}
--- a/src/LegacyFulfillment/Domain/Model/ShippingAddress.php
+++ b/src/LegacyFulfillment/Domain/Model/ShippingAddress.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Domain\Model;
+
+final readonly class ShippingAddress
+{
+    public function __construct(
+        public string $recipientName,
+        public string $street,
+        public string $city,
+        public string $postalCode,
+        public string $country,
+    ) {}
+}
--- a/src/LegacyFulfillment/Infrastructure/Gateway/FakeLegacyFulfillmentGateway.php
+++ b/src/LegacyFulfillment/Infrastructure/Gateway/FakeLegacyFulfillmentGateway.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Infrastructure\Gateway;
+
+use MiniShop\LegacyFulfillment\Application\Port\LegacyFulfillmentGateway;
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentRequest;
+
+final class FakeLegacyFulfillmentGateway implements LegacyFulfillmentGateway
+{
+    /** @var list<ShipmentRequest> */
+    private array $sentRequests = [];
+
+    public function sendShipmentRequest(ShipmentRequest $request): void
+    {
+        $this->sentRequests[] = $request;
+    }
+
+    /** @return list<ShipmentRequest> */
+    public function sentRequests(): array
+    {
+        return $this->sentRequests;
+    }
+}
--- a/src/LegacyFulfillment/Infrastructure/Persistence/InMemoryShipmentRequestRepository.php
+++ b/src/LegacyFulfillment/Infrastructure/Persistence/InMemoryShipmentRequestRepository.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Infrastructure\Persistence;
+
+use MiniShop\LegacyFulfillment\Application\Port\ShipmentRequestRepository;
+use MiniShop\LegacyFulfillment\Domain\Model\LegacyOrderRef;
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentRequest;
+
+final class InMemoryShipmentRequestRepository implements ShipmentRequestRepository
+{
+    /** @var array<string, ShipmentRequest> */
+    private array $requests = [];
+
+    public function save(ShipmentRequest $request): void
+    {
+        $this->requests[$request->orderRef->toString()] = $request;
+    }
+
+    public function findByOrderRef(LegacyOrderRef $orderRef): ?ShipmentRequest
+    {
+        return $this->requests[$orderRef->toString()] ?? null;
+    }
+}
--- a/src/LegacyFulfillment/Interfaces/Http/GetShipmentController.php
+++ b/src/LegacyFulfillment/Interfaces/Http/GetShipmentController.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Interfaces\Http;
+
+use MiniShop\LegacyFulfillment\Application\Query\GetShipmentByExternalOrderRef;
+use MiniShop\LegacyFulfillment\Application\Query\GetShipmentByExternalOrderRefHandler;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/fulfillment/orders/{externalOrderId}/shipment', name: 'fulfillment_get_shipment', methods: ['GET'])]
+final readonly class GetShipmentController
+{
+    public function __construct(
+        private GetShipmentByExternalOrderRefHandler $handler,
+    ) {}
+
+    public function __invoke(string $externalOrderId): JsonResponse
+    {
+        $shipment = ($this->handler)(new GetShipmentByExternalOrderRef($externalOrderId));
+
+        if ($shipment === null) {
+            return new JsonResponse(['error' => 'Shipment not found.'], Response::HTTP_NOT_FOUND);
+        }
+
+        return new JsonResponse([
+            'orderRef' => $shipment->orderRef->toString(),
+            'status' => $shipment->status()->value,
+            'address' => [
+                'recipientName' => $shipment->address->recipientName,
+                'street' => $shipment->address->street,
+                'city' => $shipment->address->city,
+                'postalCode' => $shipment->address->postalCode,
+                'country' => $shipment->address->country,
+            ],
+            'parcel' => [
+                'weightInGrams' => $shipment->parcel->weightInGrams,
+                'description' => $shipment->parcel->description,
+            ],
+        ]);
+    }
+}
--- a/src/Sales/Application/Command/CancelOrder.php
+++ b/src/Sales/Application/Command/CancelOrder.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Command;
+
+final readonly class CancelOrder
+{
+    public function __construct(
+        public string $orderId,
+    ) {}
+}
--- a/src/Sales/Application/Command/CancelOrderHandler.php
+++ b/src/Sales/Application/Command/CancelOrderHandler.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Command;
+
+use MiniShop\Sales\Application\Port\OrderRepository;
+use MiniShop\Sales\Application\Port\SalesEventPublisher;
+use MiniShop\Sales\Domain\Event\OrderCancelled;
+use MiniShop\Sales\Domain\Model\OrderId;
+
+final readonly class CancelOrderHandler
+{
+    public function __construct(
+        private OrderRepository $orderRepository,
+        private SalesEventPublisher $publisher,
+    ) {}
+
+    public function __invoke(CancelOrder $command): void
+    {
+        $order = $this->orderRepository->get(OrderId::fromString($command->orderId));
+        $order->cancel();
+        $this->orderRepository->save($order);
+
+        foreach ($order->releaseEvents() as $event) {
+            if ($event instanceof OrderCancelled) {
+                $this->publisher->publishOrderCancelled($event);
+            }
+        }
+    }
+}
--- a/src/Sales/Application/Command/ConfirmOrder.php
+++ b/src/Sales/Application/Command/ConfirmOrder.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Command;
+
+final readonly class ConfirmOrder
+{
+    public function __construct(
+        public string $orderId,
+    ) {}
+}
--- a/src/Sales/Application/Command/ConfirmOrderHandler.php
+++ b/src/Sales/Application/Command/ConfirmOrderHandler.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Command;
+
+use MiniShop\Sales\Application\Port\OrderRepository;
+use MiniShop\Sales\Application\Port\SalesEventPublisher;
+use MiniShop\Sales\Domain\Event\OrderConfirmed;
+use MiniShop\Sales\Domain\Model\OrderId;
+
+final readonly class ConfirmOrderHandler
+{
+    public function __construct(
+        private OrderRepository $orderRepository,
+        private SalesEventPublisher $publisher,
+    ) {}
+
+    public function __invoke(ConfirmOrder $command): void
+    {
+        $order = $this->orderRepository->get(OrderId::fromString($command->orderId));
+        $order->confirm();
+        $this->orderRepository->save($order);
+
+        foreach ($order->releaseEvents() as $event) {
+            if ($event instanceof OrderConfirmed) {
+                $this->publisher->publishOrderConfirmed($event);
+            }
+        }
+    }
+}
--- a/src/Sales/Application/Command/PlaceOrder.php
+++ b/src/Sales/Application/Command/PlaceOrder.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Command;
+
+final readonly class PlaceOrder
+{
+    /**
+     * @param list<array{productName: string, quantity: int, unitPriceInCents: int, currency: string}> $lines
+     */
+    public function __construct(
+        public string $orderId,
+        public string $customerId,
+        public array $lines,
+    ) {}
+}
--- a/src/Sales/Application/Command/PlaceOrderHandler.php
+++ b/src/Sales/Application/Command/PlaceOrderHandler.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Command;
+
+use MiniShop\Sales\Application\Port\OrderRepository;
+use MiniShop\Sales\Application\Port\SalesEventPublisher;
+use MiniShop\Sales\Domain\Event\OrderPlaced;
+use MiniShop\Sales\Domain\Model\CustomerId;
+use MiniShop\Sales\Domain\Model\Money;
+use MiniShop\Sales\Domain\Model\Order;
+use MiniShop\Sales\Domain\Model\OrderId;
+use MiniShop\Sales\Domain\Model\OrderLine;
+use MiniShop\Shared\Technical\Clock;
+
+final readonly class PlaceOrderHandler
+{
+    public function __construct(
+        private OrderRepository $orderRepository,
+        private SalesEventPublisher $publisher,
+        private Clock $clock,
+    ) {}
+
+    public function __invoke(PlaceOrder $command): void
+    {
+        $lines = array_map(
+            static fn (array $line): OrderLine => new OrderLine(
+                $line['productName'],
+                $line['quantity'],
+                new Money($line['unitPriceInCents'], $line['currency']),
+            ),
+            $command->lines,
+        );
+
+        $order = Order::place(
+            OrderId::fromString($command->orderId),
+            CustomerId::fromString($command->customerId),
+            $lines,
+            $this->clock->now(),
+        );
+
+        $this->orderRepository->save($order);
+
+        foreach ($order->releaseEvents() as $event) {
+            if ($event instanceof OrderPlaced) {
+                $this->publisher->publishOrderPlaced($event);
+            }
+        }
+    }
+}
--- a/src/Sales/Application/Port/OrderRepository.php
+++ b/src/Sales/Application/Port/OrderRepository.php
@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Port;
+
+use MiniShop\Sales\Domain\Model\CustomerId;
+use MiniShop\Sales\Domain\Model\Order;
+use MiniShop\Sales\Domain\Model\OrderId;
+
+interface OrderRepository
+{
+    public function save(Order $order): void;
+
+    public function get(OrderId $id): Order;
+
+    /** @return list<Order> */
+    public function findByCustomer(CustomerId $customerId): array;
+}
--- a/src/Sales/Application/Port/SalesEventPublisher.php
+++ b/src/Sales/Application/Port/SalesEventPublisher.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Port;
+
+use MiniShop\Sales\Domain\Event\OrderCancelled;
+use MiniShop\Sales\Domain\Event\OrderConfirmed;
+use MiniShop\Sales\Domain\Event\OrderPlaced;
+
+interface SalesEventPublisher
+{
+    public function publishOrderPlaced(OrderPlaced $event): void;
+
+    public function publishOrderConfirmed(OrderConfirmed $event): void;
+
+    public function publishOrderCancelled(OrderCancelled $event): void;
+}
--- a/src/Sales/Application/Query/GetOrderById.php
+++ b/src/Sales/Application/Query/GetOrderById.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Query;
+
+final readonly class GetOrderById
+{
+    public function __construct(
+        public string $orderId,
+    ) {}
+}
--- a/src/Sales/Application/Query/GetOrderByIdHandler.php
+++ b/src/Sales/Application/Query/GetOrderByIdHandler.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Query;
+
+use MiniShop\Sales\Application\Port\OrderRepository;
+use MiniShop\Sales\Domain\Model\Order;
+use MiniShop\Sales\Domain\Model\OrderId;
+
+final readonly class GetOrderByIdHandler
+{
+    public function __construct(
+        private OrderRepository $orderRepository,
+    ) {}
+
+    public function __invoke(GetOrderById $query): Order
+    {
+        return $this->orderRepository->get(OrderId::fromString($query->orderId));
+    }
+}
--- a/src/Sales/Application/Query/ListOrdersByCustomer.php
+++ b/src/Sales/Application/Query/ListOrdersByCustomer.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Query;
+
+final readonly class ListOrdersByCustomer
+{
+    public function __construct(
+        public string $customerId,
+    ) {}
+}
--- a/src/Sales/Application/Query/ListOrdersByCustomerHandler.php
+++ b/src/Sales/Application/Query/ListOrdersByCustomerHandler.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Query;
+
+use MiniShop\Sales\Application\Port\OrderRepository;
+use MiniShop\Sales\Domain\Model\CustomerId;
+use MiniShop\Sales\Domain\Model\Order;
+
+final readonly class ListOrdersByCustomerHandler
+{
+    public function __construct(
+        private OrderRepository $orderRepository,
+    ) {}
+
+    /** @return list<Order> */
+    public function __invoke(ListOrdersByCustomer $query): array
+    {
+        return $this->orderRepository->findByCustomer(CustomerId::fromString($query->customerId));
+    }
+}
--- a/src/Sales/Domain/Event/OrderCancelled.php
+++ b/src/Sales/Domain/Event/OrderCancelled.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Event;
+
+use MiniShop\Sales\Domain\Model\OrderId;
+
+final readonly class OrderCancelled
+{
+    public function __construct(
+        public OrderId $orderId,
+    ) {}
+}
--- a/src/Sales/Domain/Event/OrderConfirmed.php
+++ b/src/Sales/Domain/Event/OrderConfirmed.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Event;
+
+use MiniShop\Sales\Domain\Model\CustomerId;
+use MiniShop\Sales\Domain\Model\Money;
+use MiniShop\Sales\Domain\Model\OrderId;
+use MiniShop\Sales\Domain\Model\OrderLine;
+
+final readonly class OrderConfirmed
+{
+    /**
+     * @param list<OrderLine> $lines
+     */
+    public function __construct(
+        public OrderId $orderId,
+        public CustomerId $customerId,
+        public Money $total,
+        public array $lines,
+    ) {}
+}
--- a/src/Sales/Domain/Event/OrderPlaced.php
+++ b/src/Sales/Domain/Event/OrderPlaced.php
@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Event;
+
+use MiniShop\Sales\Domain\Model\CustomerId;
+use MiniShop\Sales\Domain\Model\Money;
+use MiniShop\Sales\Domain\Model\OrderId;
+
+final readonly class OrderPlaced
+{
+    public function __construct(
+        public OrderId $orderId,
+        public CustomerId $customerId,
+        public Money $total,
+        public \DateTimeImmutable $placedAt,
+    ) {}
+}
--- a/src/Sales/Domain/Exception/EmptyOrderException.php
+++ b/src/Sales/Domain/Exception/EmptyOrderException.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Exception;
+
+final class EmptyOrderException extends \DomainException
+{
+    public static function noLines(): self
+    {
+        return new self('An order must have at least one line.');
+    }
+
+    public static function cannotConfirmEmpty(): self
+    {
+        return new self('Cannot confirm an order with no lines.');
+    }
+}
--- a/src/Sales/Domain/Exception/InvalidOrderStateException.php
+++ b/src/Sales/Domain/Exception/InvalidOrderStateException.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Exception;
+
+use MiniShop\Sales\Domain\Model\OrderStatus;
+
+final class InvalidOrderStateException extends \DomainException
+{
+    public static function cannotConfirm(OrderStatus $current): self
+    {
+        return new self(sprintf('Cannot confirm order in "%s" state.', $current->value));
+    }
+
+    public static function cannotCancel(OrderStatus $current): self
+    {
+        return new self(sprintf('Cannot cancel order in "%s" state.', $current->value));
+    }
+}
--- a/src/Sales/Domain/Model/CustomerId.php
+++ b/src/Sales/Domain/Model/CustomerId.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Model;
+
+final readonly class CustomerId
+{
+    private function __construct(public string $value) {}
+
+    public static function fromString(string $value): self
+    {
+        return new self($value);
+    }
+
+    public function toString(): string
+    {
+        return $this->value;
+    }
+
+    public function equals(self $other): bool
+    {
+        return $this->value === $other->value;
+    }
+}
--- a/src/Sales/Domain/Model/Money.php
+++ b/src/Sales/Domain/Model/Money.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Model;
+
+final readonly class Money
+{
+    public function __construct(
+        public int $amount,
+        public string $currency,
+    ) {}
+
+    public static function zero(string $currency): self
+    {
+        return new self(0, $currency);
+    }
+
+    public function add(self $other): self
+    {
+        if ($this->currency !== $other->currency) {
+            throw new \InvalidArgumentException(
+                sprintf('Cannot add %s to %s.', $other->currency, $this->currency),
+            );
+        }
+
+        return new self($this->amount + $other->amount, $this->currency);
+    }
+
+    public function isPositive(): bool
+    {
+        return $this->amount > 0;
+    }
+
+    public function equals(self $other): bool
+    {
+        return $this->amount === $other->amount && $this->currency === $other->currency;
+    }
+}
--- a/src/Sales/Domain/Model/Order.php
+++ b/src/Sales/Domain/Model/Order.php
@@ -0,0 +1,115 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Model;
+
+use MiniShop\Sales\Domain\Event\OrderCancelled;
+use MiniShop\Sales\Domain\Event\OrderConfirmed;
+use MiniShop\Sales\Domain\Event\OrderPlaced;
+use MiniShop\Sales\Domain\Exception\EmptyOrderException;
+use MiniShop\Sales\Domain\Exception\InvalidOrderStateException;
+
+final class Order
+{
+    private OrderStatus $status;
+    /** @var list<OrderLine> */
+    private array $lines;
+    /** @var list<object> */
+    private array $domainEvents = [];
+
+    private function __construct(
+        public readonly OrderId $id,
+        public readonly CustomerId $customerId,
+        private readonly \DateTimeImmutable $placedAt,
+    ) {
+        $this->status = OrderStatus::Draft;
+        $this->lines = [];
+    }
+
+    /**
+     * @param list<OrderLine> $lines
+     */
+    public static function place(
+        OrderId $id,
+        CustomerId $customerId,
+        array $lines,
+        \DateTimeImmutable $placedAt,
+    ): self {
+        if ($lines === []) {
+            throw EmptyOrderException::noLines();
+        }
+
+        $order = new self($id, $customerId, $placedAt);
+        $order->lines = $lines;
+        $order->status = OrderStatus::Placed;
+
+        $order->recordEvent(new OrderPlaced($id, $customerId, $order->total(), $placedAt));
+
+        return $order;
+    }
+
+    public function confirm(): void
+    {
+        if ($this->status !== OrderStatus::Placed) {
+            throw InvalidOrderStateException::cannotConfirm($this->status);
+        }
+
+        $this->status = OrderStatus::Confirmed;
+        $this->recordEvent(new OrderConfirmed(
+            $this->id,
+            $this->customerId,
+            $this->total(),
+            $this->lines,
+        ));
+    }
+
+    public function cancel(): void
+    {
+        if ($this->status !== OrderStatus::Placed) {
+            throw InvalidOrderStateException::cannotCancel($this->status);
+        }
+
+        $this->status = OrderStatus::Cancelled;
+        $this->recordEvent(new OrderCancelled($this->id));
+    }
+
+    public function total(): Money
+    {
+        return array_reduce(
+            $this->lines,
+            static fn (Money $carry, OrderLine $line): Money => $carry->add($line->lineTotal()),
+            Money::zero($this->lines[0]->unitPrice->currency),
+        );
+    }
+
+    public function status(): OrderStatus
+    {
+        return $this->status;
+    }
+
+    /** @return list<OrderLine> */
+    public function lines(): array
+    {
+        return $this->lines;
+    }
+
+    public function placedAt(): \DateTimeImmutable
+    {
+        return $this->placedAt;
+    }
+
+    /** @return list<object> */
+    public function releaseEvents(): array
+    {
+        $events = $this->domainEvents;
+        $this->domainEvents = [];
+
+        return $events;
+    }
+
+    private function recordEvent(object $event): void
+    {
+        $this->domainEvents[] = $event;
+    }
+}
--- a/src/Sales/Domain/Model/OrderId.php
+++ b/src/Sales/Domain/Model/OrderId.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Model;
+
+final readonly class OrderId
+{
+    private function __construct(public string $value) {}
+
+    public static function fromString(string $value): self
+    {
+        return new self($value);
+    }
+
+    public function toString(): string
+    {
+        return $this->value;
+    }
+
+    public function equals(self $other): bool
+    {
+        return $this->value === $other->value;
+    }
+}
--- a/src/Sales/Domain/Model/OrderLine.php
+++ b/src/Sales/Domain/Model/OrderLine.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Model;
+
+final readonly class OrderLine
+{
+    public function __construct(
+        public string $productName,
+        public int $quantity,
+        public Money $unitPrice,
+    ) {
+        if ($quantity <= 0) {
+            throw new \InvalidArgumentException('Quantity must be positive.');
+        }
+    }
+
+    public function lineTotal(): Money
+    {
+        return new Money(
+            $this->unitPrice->amount * $this->quantity,
+            $this->unitPrice->currency,
+        );
+    }
+}
--- a/src/Sales/Domain/Model/OrderStatus.php
+++ b/src/Sales/Domain/Model/OrderStatus.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Domain\Model;
+
+enum OrderStatus: string
+{
+    case Draft = 'draft';
+    case Placed = 'placed';
+    case Confirmed = 'confirmed';
+    case Cancelled = 'cancelled';
+}
--- a/src/Sales/Infrastructure/Messaging/NaiveSalesEventPublisher.php
+++ b/src/Sales/Infrastructure/Messaging/NaiveSalesEventPublisher.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Infrastructure\Messaging;
+
+use MiniShop\Invoicing\Application\Command\IssueInvoiceForExternalOrder;
+use MiniShop\Invoicing\Application\Command\IssueInvoiceForExternalOrderHandler;
+use MiniShop\LegacyFulfillment\Application\Command\RequestShipmentFromSalesOrder;
+use MiniShop\LegacyFulfillment\Application\Command\RequestShipmentFromSalesOrderHandler;
+use MiniShop\Sales\Application\Port\SalesEventPublisher;
+use MiniShop\Sales\Domain\Event\OrderCancelled;
+use MiniShop\Sales\Domain\Event\OrderConfirmed;
+use MiniShop\Sales\Domain\Event\OrderPlaced;
+use MiniShop\Sales\Domain\Model\OrderLine;
+
+/**
+ * Couplage naif : Sales appelle directement les handlers des autres BC.
+ * Ce couplage sera supprime dans les episodes suivants (Published Language, Conformist, ACL).
+ */
+final readonly class NaiveSalesEventPublisher implements SalesEventPublisher
+{
+    public function __construct(
+        private IssueInvoiceForExternalOrderHandler $issueInvoiceHandler,
+        private RequestShipmentFromSalesOrderHandler $requestShipmentHandler,
+    ) {}
+
+    public function publishOrderPlaced(OrderPlaced $event): void
+    {
+        // Pas d'action downstream sur OrderPlaced dans le scenario naif.
+    }
+
+    public function publishOrderConfirmed(OrderConfirmed $event): void
+    {
+        // Appel direct vers Invoicing — couplage naif
+        ($this->issueInvoiceHandler)(new IssueInvoiceForExternalOrder(
+            externalOrderId: $event->orderId->toString(),
+            customerName: 'Customer ' . $event->customerId->toString(),
+            customerAddress: 'N/A',
+            lines: array_map(
+                static fn (OrderLine $line): array => [
+                    'description' => $line->productName,
+                    'quantity' => $line->quantity,
+                    'unitPriceInCents' => $line->unitPrice->amount,
+                    'currency' => $line->unitPrice->currency,
+                ],
+                $event->lines,
+            ),
+        ));
+
+        // Appel direct vers LegacyFulfillment — couplage naif
+        ($this->requestShipmentHandler)(new RequestShipmentFromSalesOrder(
+            externalOrderId: $event->orderId->toString(),
+            recipientName: 'Customer ' . $event->customerId->toString(),
+            street: '1 Rue du Commerce',
+            city: 'Paris',
+            postalCode: '75001',
+            country: 'FR',
+            totalWeightInGrams: 1000,
+            description: sprintf('Order %s', $event->orderId->toString()),
+        ));
+    }
+
+    public function publishOrderCancelled(OrderCancelled $event): void
+    {
+        // Pas d'action downstream sur OrderCancelled dans le scenario naif.
+    }
+}
--- a/src/Sales/Infrastructure/Persistence/InMemoryOrderRepository.php
+++ b/src/Sales/Infrastructure/Persistence/InMemoryOrderRepository.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Infrastructure\Persistence;
+
+use MiniShop\Sales\Application\Port\OrderRepository;
+use MiniShop\Sales\Domain\Model\CustomerId;
+use MiniShop\Sales\Domain\Model\Order;
+use MiniShop\Sales\Domain\Model\OrderId;
+
+final class InMemoryOrderRepository implements OrderRepository
+{
+    /** @var array<string, Order> */
+    private array $orders = [];
+
+    public function save(Order $order): void
+    {
+        $this->orders[$order->id->toString()] = $order;
+    }
+
+    public function get(OrderId $id): Order
+    {
+        return $this->orders[$id->toString()]
+            ?? throw new \RuntimeException(sprintf('Order "%s" not found.', $id->toString()));
+    }
+
+    /** @return list<Order> */
+    public function findByCustomer(CustomerId $customerId): array
+    {
+        return array_values(
+            array_filter(
+                $this->orders,
+                static fn (Order $order): bool => $order->customerId->equals($customerId),
+            ),
+        );
+    }
+}
--- a/src/Sales/Interfaces/Http/CancelOrderController.php
+++ b/src/Sales/Interfaces/Http/CancelOrderController.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Interfaces\Http;
+
+use MiniShop\Sales\Application\Command\CancelOrder;
+use MiniShop\Sales\Application\Command\CancelOrderHandler;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/sales/orders/{orderId}/cancel', name: 'sales_cancel_order', methods: ['POST'])]
+final readonly class CancelOrderController
+{
+    public function __construct(
+        private CancelOrderHandler $handler,
+    ) {}
+
+    public function __invoke(string $orderId): JsonResponse
+    {
+        ($this->handler)(new CancelOrder(orderId: $orderId));
+
+        return new JsonResponse(null, Response::HTTP_NO_CONTENT);
+    }
+}
--- a/src/Sales/Interfaces/Http/ConfirmOrderController.php
+++ b/src/Sales/Interfaces/Http/ConfirmOrderController.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Interfaces\Http;
+
+use MiniShop\Sales\Application\Command\ConfirmOrder;
+use MiniShop\Sales\Application\Command\ConfirmOrderHandler;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/sales/orders/{orderId}/confirm', name: 'sales_confirm_order', methods: ['POST'])]
+final readonly class ConfirmOrderController
+{
+    public function __construct(
+        private ConfirmOrderHandler $handler,
+    ) {}
+
+    public function __invoke(string $orderId): JsonResponse
+    {
+        ($this->handler)(new ConfirmOrder(orderId: $orderId));
+
+        return new JsonResponse(null, Response::HTTP_NO_CONTENT);
+    }
+}
--- a/src/Sales/Interfaces/Http/GetOrderController.php
+++ b/src/Sales/Interfaces/Http/GetOrderController.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Interfaces\Http;
+
+use MiniShop\Sales\Application\Query\GetOrderById;
+use MiniShop\Sales\Application\Query\GetOrderByIdHandler;
+use MiniShop\Sales\Domain\Model\OrderLine;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/sales/orders/{orderId}', name: 'sales_get_order', methods: ['GET'])]
+final readonly class GetOrderController
+{
+    public function __construct(
+        private GetOrderByIdHandler $handler,
+    ) {}
+
+    public function __invoke(string $orderId): JsonResponse
+    {
+        $order = ($this->handler)(new GetOrderById($orderId));
+
+        return new JsonResponse([
+            'orderId' => $order->id->toString(),
+            'customerId' => $order->customerId->toString(),
+            'status' => $order->status()->value,
+            'total' => [
+                'amount' => $order->total()->amount,
+                'currency' => $order->total()->currency,
+            ],
+            'lines' => array_map(
+                static fn (OrderLine $line): array => [
+                    'productName' => $line->productName,
+                    'quantity' => $line->quantity,
+                    'unitPrice' => $line->unitPrice->amount,
+                    'currency' => $line->unitPrice->currency,
+                    'lineTotal' => $line->lineTotal()->amount,
+                ],
+                $order->lines(),
+            ),
+        ]);
+    }
+}
--- a/src/Sales/Interfaces/Http/ListCustomerOrdersController.php
+++ b/src/Sales/Interfaces/Http/ListCustomerOrdersController.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Interfaces\Http;
+
+use MiniShop\Sales\Application\Query\ListOrdersByCustomer;
+use MiniShop\Sales\Application\Query\ListOrdersByCustomerHandler;
+use MiniShop\Sales\Domain\Model\Order;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/sales/customers/{customerId}/orders', name: 'sales_list_customer_orders', methods: ['GET'])]
+final readonly class ListCustomerOrdersController
+{
+    public function __construct(
+        private ListOrdersByCustomerHandler $handler,
+    ) {}
+
+    public function __invoke(string $customerId): JsonResponse
+    {
+        $orders = ($this->handler)(new ListOrdersByCustomer($customerId));
+
+        return new JsonResponse(array_map(
+            static fn (Order $order): array => [
+                'orderId' => $order->id->toString(),
+                'status' => $order->status()->value,
+                'total' => [
+                    'amount' => $order->total()->amount,
+                    'currency' => $order->total()->currency,
+                ],
+            ],
+            $orders,
+        ));
+    }
+}
--- a/src/Sales/Interfaces/Http/PlaceOrderController.php
+++ b/src/Sales/Interfaces/Http/PlaceOrderController.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Interfaces\Http;
+
+use MiniShop\Sales\Application\Command\PlaceOrder;
+use MiniShop\Sales\Application\Command\PlaceOrderHandler;
+use MiniShop\Shared\Technical\UuidGenerator;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/sales/orders', name: 'sales_place_order', methods: ['POST'])]
+final readonly class PlaceOrderController
+{
+    public function __construct(
+        private PlaceOrderHandler $handler,
+    ) {}
+
+    public function __invoke(Request $request): JsonResponse
+    {
+        /** @var array{customerId: string, lines: list<array{productName: string, quantity: int, unitPriceInCents: int, currency: string}>} $data */
+        $data = json_decode($request->getContent(), true, flags: JSON_THROW_ON_ERROR);
+
+        $orderId = UuidGenerator::generate();
+
+        ($this->handler)(new PlaceOrder(
+            orderId: $orderId,
+            customerId: $data['customerId'],
+            lines: $data['lines'],
+        ));
+
+        return new JsonResponse(['orderId' => $orderId], Response::HTTP_CREATED);
+    }
+}
--- a/src/Shared/Technical/Clock.php
+++ b/src/Shared/Technical/Clock.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Shared\Technical;
+
+interface Clock
+{
+    public function now(): \DateTimeImmutable;
+}
--- a/src/Shared/Technical/SystemClock.php
+++ b/src/Shared/Technical/SystemClock.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Shared\Technical;
+
+final class SystemClock implements Clock
+{
+    public function now(): \DateTimeImmutable
+    {
+        return new \DateTimeImmutable();
+    }
+}
--- a/src/Shared/Technical/UuidGenerator.php
+++ b/src/Shared/Technical/UuidGenerator.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Shared\Technical;
+
+final class UuidGenerator
+{
+    public static function generate(): string
+    {
+        $bytes = random_bytes(16);
+        $bytes[6] = chr(ord($bytes[6]) & 0x0f | 0x40);
+        $bytes[8] = chr(ord($bytes[8]) & 0x3f | 0x80);
+
+        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($bytes), 4));
+    }
+}
--- a/tests/Contract/.gitkeep
+++ b/tests/Contract/.gitkeep
--- a/tests/Integration/NaiveWorkflowTest.php
+++ b/tests/Integration/NaiveWorkflowTest.php
@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Tests\Integration;
+
+use MiniShop\Invoicing\Application\Command\IssueInvoiceForExternalOrderHandler;
+use MiniShop\Invoicing\Infrastructure\Persistence\InMemoryInvoiceRepository;
+use MiniShop\Invoicing\Infrastructure\SequentialInvoiceNumberGenerator;
+use MiniShop\LegacyFulfillment\Application\Command\RequestShipmentFromSalesOrderHandler;
+use MiniShop\LegacyFulfillment\Domain\Model\LegacyOrderRef;
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentStatus;
+use MiniShop\LegacyFulfillment\Infrastructure\Gateway\FakeLegacyFulfillmentGateway;
+use MiniShop\LegacyFulfillment\Infrastructure\Persistence\InMemoryShipmentRequestRepository;
+use MiniShop\Sales\Application\Command\ConfirmOrder;
+use MiniShop\Sales\Application\Command\ConfirmOrderHandler;
+use MiniShop\Sales\Application\Command\PlaceOrder;
+use MiniShop\Sales\Application\Command\PlaceOrderHandler;
+use MiniShop\Sales\Domain\Model\OrderId;
+use MiniShop\Sales\Domain\Model\OrderStatus;
+use MiniShop\Sales\Infrastructure\Messaging\NaiveSalesEventPublisher;
+use MiniShop\Sales\Infrastructure\Persistence\InMemoryOrderRepository;
+use MiniShop\Shared\Technical\SystemClock;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test d'integration naif : PlaceOrder -> ConfirmOrder -> Invoice + Shipment.
+ * Illustre le couplage direct entre BC (episode 00).
+ */
+final class NaiveWorkflowTest extends TestCase
+{
+    public function test_full_naive_workflow(): void
+    {
+        // --- Setup : cablage naif synchrone ---
+        $clock = new SystemClock();
+        $orderRepo = new InMemoryOrderRepository();
+        $invoiceRepo = new InMemoryInvoiceRepository();
+        $shipmentRepo = new InMemoryShipmentRequestRepository();
+        $gateway = new FakeLegacyFulfillmentGateway();
+
+        $issueInvoiceHandler = new IssueInvoiceForExternalOrderHandler(
+            $invoiceRepo,
+            new SequentialInvoiceNumberGenerator(),
+            $clock,
+        );
+        $requestShipmentHandler = new RequestShipmentFromSalesOrderHandler(
+            $shipmentRepo,
+            $gateway,
+            $clock,
+        );
+        $publisher = new NaiveSalesEventPublisher($issueInvoiceHandler, $requestShipmentHandler);
+
+        $placeOrderHandler = new PlaceOrderHandler($orderRepo, $publisher, $clock);
+        $confirmOrderHandler = new ConfirmOrderHandler($orderRepo, $publisher);
+
+        $orderId = 'test-order-001';
+
+        // --- Act : passer et confirmer une commande ---
+        ($placeOrderHandler)(new PlaceOrder(
+            orderId: $orderId,
+            customerId: 'cust-001',
+            lines: [
+                ['productName' => 'Widget', 'quantity' => 2, 'unitPriceInCents' => 1500, 'currency' => 'EUR'],
+                ['productName' => 'Gadget', 'quantity' => 1, 'unitPriceInCents' => 2500, 'currency' => 'EUR'],
+            ],
+        ));
+
+        ($confirmOrderHandler)(new ConfirmOrder(orderId: $orderId));
+
+        // --- Assert : ordre confirme ---
+        $order = $orderRepo->get(OrderId::fromString($orderId));
+        self::assertSame(OrderStatus::Confirmed, $order->status());
+
+        // --- Assert : facture creee ---
+        $invoice = $invoiceRepo->findByExternalOrderId($orderId);
+        self::assertNotNull($invoice, 'An invoice should have been created for the confirmed order.');
+        self::assertSame($orderId, $invoice->externalOrderId);
+        self::assertCount(2, $invoice->lines());
+
+        // --- Assert : expedition demandee ---
+        $shipment = $shipmentRepo->findByOrderRef(LegacyOrderRef::fromExternalId($orderId));
+        self::assertNotNull($shipment, 'A shipment request should have been created.');
+        self::assertSame(ShipmentStatus::Requested, $shipment->status());
+
+        // --- Assert : gateway legacy appele ---
+        self::assertCount(1, $gateway->sentRequests());
+    }
+}
--- a/tests/Unit/Invoicing/Domain/InvoiceTest.php
+++ b/tests/Unit/Invoicing/Domain/InvoiceTest.php
@@ -0,0 +1,97 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Tests\Unit\Invoicing\Domain;
+
+use MiniShop\Invoicing\Domain\Event\InvoiceIssued;
+use MiniShop\Invoicing\Domain\Model\BillingParty;
+use MiniShop\Invoicing\Domain\Model\Invoice;
+use MiniShop\Invoicing\Domain\Model\InvoiceId;
+use MiniShop\Invoicing\Domain\Model\InvoiceLine;
+use MiniShop\Invoicing\Domain\Model\InvoiceStatus;
+use MiniShop\Invoicing\Domain\Model\TaxRate;
+use PHPUnit\Framework\TestCase;
+
+final class InvoiceTest extends TestCase
+{
+    public function test_issue_invoice_for_external_order(): void
+    {
+        $invoice = $this->issueInvoice();
+
+        self::assertSame(InvoiceStatus::Issued, $invoice->status());
+        self::assertSame('ext-order-1', $invoice->externalOrderId);
+        self::assertCount(1, $invoice->lines());
+    }
+
+    public function test_issue_invoice_records_event(): void
+    {
+        $invoice = $this->issueInvoice();
+
+        $events = $invoice->releaseEvents();
+        self::assertCount(1, $events);
+        self::assertInstanceOf(InvoiceIssued::class, $events[0]);
+    }
+
+    public function test_invoice_without_lines_throws(): void
+    {
+        $this->expectException(\DomainException::class);
+
+        Invoice::issueForExternalOrder(
+            InvoiceId::fromString('inv-1'),
+            'INV-000001',
+            'ext-order-1',
+            new BillingParty('Acme', '1 Rue Test'),
+            [],
+            new \DateTimeImmutable(),
+        );
+    }
+
+    public function test_total_coherent_with_lines(): void
+    {
+        $invoice = Invoice::issueForExternalOrder(
+            InvoiceId::fromString('inv-1'),
+            'INV-000001',
+            'ext-order-1',
+            new BillingParty('Acme', '1 Rue Test'),
+            [
+                new InvoiceLine('Widget', 2, 1000, 'EUR', TaxRate::standard()),
+                new InvoiceLine('Gadget', 1, 2500, 'EUR', TaxRate::standard()),
+            ],
+            new \DateTimeImmutable(),
+        );
+
+        self::assertSame(4500, $invoice->totalExclTax());
+        self::assertSame(5400, $invoice->totalInclTax());
+    }
+
+    public function test_mark_as_sent(): void
+    {
+        $invoice = $this->issueInvoice();
+
+        $invoice->markAsSent();
+
+        self::assertSame(InvoiceStatus::Sent, $invoice->status());
+    }
+
+    public function test_mark_as_sent_twice_throws(): void
+    {
+        $this->expectException(\DomainException::class);
+
+        $invoice = $this->issueInvoice();
+        $invoice->markAsSent();
+        $invoice->markAsSent();
+    }
+
+    private function issueInvoice(): Invoice
+    {
+        return Invoice::issueForExternalOrder(
+            InvoiceId::fromString('inv-1'),
+            'INV-000001',
+            'ext-order-1',
+            new BillingParty('Acme', '1 Rue Test'),
+            [new InvoiceLine('Widget', 2, 1500, 'EUR', TaxRate::standard())],
+            new \DateTimeImmutable(),
+        );
+    }
+}
--- a/tests/Unit/LegacyFulfillment/Domain/ShipmentRequestTest.php
+++ b/tests/Unit/LegacyFulfillment/Domain/ShipmentRequestTest.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Tests\Unit\LegacyFulfillment\Domain;
+
+use MiniShop\LegacyFulfillment\Domain\Event\ShipmentRequested;
+use MiniShop\LegacyFulfillment\Domain\Model\LegacyOrderRef;
+use MiniShop\LegacyFulfillment\Domain\Model\ParcelSpec;
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentRequest;
+use MiniShop\LegacyFulfillment\Domain\Model\ShipmentStatus;
+use MiniShop\LegacyFulfillment\Domain\Model\ShippingAddress;
+use PHPUnit\Framework\TestCase;
+
+final class ShipmentRequestTest extends TestCase
+{
+    public function test_create_from_sales_order(): void
+    {
+        $request = $this->createRequest();
+
+        self::assertSame(ShipmentStatus::Requested, $request->status());
+        self::assertSame('order-1', $request->orderRef->toString());
+    }
+
+    public function test_create_records_event(): void
+    {
+        $request = $this->createRequest();
+
+        $events = $request->releaseEvents();
+        self::assertCount(1, $events);
+        self::assertInstanceOf(ShipmentRequested::class, $events[0]);
+    }
+
+    public function test_mark_dispatched(): void
+    {
+        $request = $this->createRequest();
+
+        $request->markDispatched();
+
+        self::assertSame(ShipmentStatus::Dispatched, $request->status());
+    }
+
+    public function test_mark_dispatched_twice_throws(): void
+    {
+        $this->expectException(\DomainException::class);
+
+        $request = $this->createRequest();
+        $request->markDispatched();
+        $request->markDispatched();
+    }
+
+    public function test_parcel_with_zero_weight_throws(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+
+        new ParcelSpec(0, 'Widget');
+    }
+
+    private function createRequest(): ShipmentRequest
+    {
+        return ShipmentRequest::fromSalesOrder(
+            LegacyOrderRef::fromExternalId('order-1'),
+            new ShippingAddress('John Doe', '1 Rue du Commerce', 'Paris', '75001', 'FR'),
+            new ParcelSpec(1000, 'Order order-1'),
+            new \DateTimeImmutable(),
+        );
+    }
+}
--- a/tests/Unit/Sales/Domain/OrderTest.php
+++ b/tests/Unit/Sales/Domain/OrderTest.php
@@ -0,0 +1,122 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Tests\Unit\Sales\Domain;
+
+use MiniShop\Sales\Domain\Event\OrderCancelled;
+use MiniShop\Sales\Domain\Event\OrderConfirmed;
+use MiniShop\Sales\Domain\Event\OrderPlaced;
+use MiniShop\Sales\Domain\Exception\EmptyOrderException;
+use MiniShop\Sales\Domain\Exception\InvalidOrderStateException;
+use MiniShop\Sales\Domain\Model\CustomerId;
+use MiniShop\Sales\Domain\Model\Money;
+use MiniShop\Sales\Domain\Model\Order;
+use MiniShop\Sales\Domain\Model\OrderId;
+use MiniShop\Sales\Domain\Model\OrderLine;
+use MiniShop\Sales\Domain\Model\OrderStatus;
+use PHPUnit\Framework\TestCase;
+
+final class OrderTest extends TestCase
+{
+    public function test_place_order_with_lines(): void
+    {
+        $order = $this->placeOrder();
+
+        self::assertSame(OrderStatus::Placed, $order->status());
+        self::assertCount(1, $order->lines());
+        self::assertTrue($order->total()->isPositive());
+    }
+
+    public function test_place_order_records_order_placed_event(): void
+    {
+        $order = $this->placeOrder();
+
+        $events = $order->releaseEvents();
+        self::assertCount(1, $events);
+        self::assertInstanceOf(OrderPlaced::class, $events[0]);
+    }
+
+    public function test_place_order_without_lines_throws(): void
+    {
+        $this->expectException(EmptyOrderException::class);
+
+        Order::place(
+            OrderId::fromString('order-1'),
+            CustomerId::fromString('cust-1'),
+            [],
+            new \DateTimeImmutable(),
+        );
+    }
+
+    public function test_confirm_placed_order(): void
+    {
+        $order = $this->placeOrder();
+        $order->releaseEvents();
+
+        $order->confirm();
+
+        self::assertSame(OrderStatus::Confirmed, $order->status());
+        $events = $order->releaseEvents();
+        self::assertCount(1, $events);
+        self::assertInstanceOf(OrderConfirmed::class, $events[0]);
+    }
+
+    public function test_confirm_draft_order_throws(): void
+    {
+        $this->expectException(InvalidOrderStateException::class);
+
+        $order = $this->placeOrder();
+        $order->confirm();
+        $order->releaseEvents();
+
+        $order->confirm(); // already confirmed
+    }
+
+    public function test_cancel_placed_order(): void
+    {
+        $order = $this->placeOrder();
+        $order->releaseEvents();
+
+        $order->cancel();
+
+        self::assertSame(OrderStatus::Cancelled, $order->status());
+        $events = $order->releaseEvents();
+        self::assertCount(1, $events);
+        self::assertInstanceOf(OrderCancelled::class, $events[0]);
+    }
+
+    public function test_cannot_cancel_confirmed_order(): void
+    {
+        $this->expectException(InvalidOrderStateException::class);
+
+        $order = $this->placeOrder();
+        $order->confirm();
+        $order->cancel();
+    }
+
+    public function test_total_is_sum_of_line_totals(): void
+    {
+        $order = Order::place(
+            OrderId::fromString('order-1'),
+            CustomerId::fromString('cust-1'),
+            [
+                new OrderLine('Widget', 2, new Money(1000, 'EUR')),
+                new OrderLine('Gadget', 1, new Money(2500, 'EUR')),
+            ],
+            new \DateTimeImmutable(),
+        );
+
+        self::assertTrue($order->total()->equals(new Money(4500, 'EUR')));
+    }
+
+    private function placeOrder(): Order
+    {
+        return Order::place(
+            OrderId::fromString('order-1'),
+            CustomerId::fromString('cust-1'),
+            [new OrderLine('Widget', 2, new Money(1500, 'EUR'))],
+            new \DateTimeImmutable(),
+        );
+    }
+}