diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4c4822f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,50 @@
+# MyLibrary — backend Java
+
+Backend métier du projet librairie (Maxime Lebreton / Marvin Aubert / Patrick Felix-Vimalaratnam).  
+Pendant visuel : dépôt **`2026-DEV-BUT3`** (React).
+
+## Stack
+
+- Java 21, Maven
+- Couche domaine : livres, clients, points de fidélité
+- **API REST** (branche `fusion`) : Spring Boot sur le port **8080**
+
+## Lancer l’API
+
+```bash
+mvn spring-boot:run
+```
+
+Vérifier : [http://localhost:8080/api/health](http://localhost:8080/api/health)
+
+## Endpoints exposés au front
+
+| Méthode | Route | Rôle |
+|---------|-------|------|
+| GET | `/api/health` | Ping |
+| GET | `/api/books` | Liste des livres (format UI) |
+| POST | `/api/books` | Créer un livre |
+| GET | `/api/books/{isbn}` | Détail |
+| DELETE | `/api/books/{isbn}` | Supprimer |
+| POST | `/api/books/{isbn}/read` | Basculer lu / non lu |
+| GET | `/api/users/{uuid}/loyalty-points` | Points fidélité client |
+
+Au démarrage, deux livres démo + un client Marie Dupont (100 pts) sont chargés si le catalogue est vide.
+
+## Brancher le front React
+
+Dans `2026-DEV-BUT3` (branche `fusion`) :
+
+```bash
+cp .env.example .env
+npm install
+npm run dev
+```
+
+Le proxy Vite envoie `/api` vers `localhost:8080`. Commandes, promos, réservations, avis, abo, prêts et groupes restent côté front (local) tant que ces use cases ne sont pas exposés ici.
+
+## Tests unitaires
+
+```bash
+mvn test
+```
diff --git a/pom.xml b/pom.xml
index 27ec78e..9358d49 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,6 +15,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
     <!--    Main dependencies -->
+    <spring.boot.version>3.4.1</spring.boot.version>
     <lombok.version>1.18.36</lombok.version>
 
     <!--    Test Verisons-->
@@ -48,6 +49,12 @@
   </dependencyManagement>
 
   <dependencies>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-web</artifactId>
+      <version>${spring.boot.version}</version>
+    </dependency>
+
     <dependency>
       <groupId>org.projectlombok</groupId>
       <artifactId>lombok</artifactId>
@@ -146,6 +153,18 @@
           </properties>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-maven-plugin</artifactId>
+        <version>${spring.boot.version}</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>repackage</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
 </project>
\ No newline at end of file
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/MyLibraryApplication.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/MyLibraryApplication.java
new file mode 100644
index 0000000..832bd3a
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/MyLibraryApplication.java
@@ -0,0 +1,12 @@
+package fr.iut_fbleau.but3.dev62.mylibrary;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MyLibraryApplication {
+
+  public static void main(String[] args) {
+    SpringApplication.run(MyLibraryApplication.class, args);
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/ApiExceptionHandler.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/ApiExceptionHandler.java
new file mode 100644
index 0000000..0cdaaec
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/ApiExceptionHandler.java
@@ -0,0 +1,23 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.api;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
+import java.util.Map;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class ApiExceptionHandler {
+
+  @ExceptionHandler(BookNotFoundException.class)
+  public ResponseEntity<Map<String, String>> handleBookNotFound(BookNotFoundException ex) {
+    return ResponseEntity.status(HttpStatus.NOT_FOUND).body(Map.of("error", ex.getMessage()));
+  }
+
+  @ExceptionHandler(NotValidBookException.class)
+  public ResponseEntity<Map<String, String>> handleNotValidBook(NotValidBookException ex) {
+    return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(Map.of("error", ex.getMessage()));
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/BookController.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/BookController.java
new file mode 100644
index 0000000..368dc78
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/BookController.java
@@ -0,0 +1,86 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.api;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.api.dto.FrontendBookRequest;
+import fr.iut_fbleau.but3.dev62.mylibrary.api.dto.FrontendBookResponse;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.BookNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.usecase.BookUseCase;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/books")
+public class BookController {
+
+  private final BookUseCase bookUseCase;
+  private final Map<String, Boolean> readStatusByIsbn = new ConcurrentHashMap<>();
+
+  public BookController(BookUseCase bookUseCase) {
+    this.bookUseCase = bookUseCase;
+  }
+
+  @GetMapping
+  public List<FrontendBookResponse> listBooks() {
+    return bookUseCase.findAllBooks().stream()
+        .map(book -> FrontendBookMapper.toResponse(book, readStatusByIsbn.getOrDefault(book.getIsbn(), false)))
+        .toList();
+  }
+
+  @GetMapping("/{id}")
+  public ResponseEntity<FrontendBookResponse> getBook(@PathVariable String id) {
+    return bookUseCase.findBookByIsbn(id)
+        .map(book -> FrontendBookMapper.toResponse(book, readStatusByIsbn.getOrDefault(id, false)))
+        .map(ResponseEntity::ok)
+        .orElse(ResponseEntity.notFound().build());
+  }
+
+  @PostMapping
+  public ResponseEntity<?> createBook(@RequestBody FrontendBookRequest request)
+      throws NotValidBookException {
+    if (request.title() == null || request.title().isBlank()
+        || request.author() == null || request.author().isBlank()) {
+      return ResponseEntity.badRequest().body(Map.of("error", "title and author are required"));
+    }
+
+    String isbn = FrontendBookMapper.generateIsbn();
+    bookUseCase.registerBook(
+        FrontendBookMapper.toBookInfo(isbn, request),
+        FrontendBookMapper.toBookSalesInfo(request),
+        FrontendBookMapper.toBookDetails(request));
+    readStatusByIsbn.put(isbn, request.read());
+
+    return bookUseCase.findBookByIsbn(isbn)
+        .map(book -> ResponseEntity.status(HttpStatus.CREATED)
+            .body(FrontendBookMapper.toResponse(book, request.read())))
+        .orElse(ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build());
+  }
+
+  @DeleteMapping("/{id}")
+  public ResponseEntity<Void> deleteBook(@PathVariable String id) throws BookNotFoundException {
+    bookUseCase.deleteBook(id);
+    readStatusByIsbn.remove(id);
+    return ResponseEntity.noContent().build();
+  }
+
+  @PostMapping("/{id}/read")
+  public ResponseEntity<FrontendBookResponse> toggleRead(@PathVariable String id) {
+    return bookUseCase.findBookByIsbn(id)
+        .map(book -> {
+          boolean next = !readStatusByIsbn.getOrDefault(id, false);
+          readStatusByIsbn.put(id, next);
+          return ResponseEntity.ok(FrontendBookMapper.toResponse(book, next));
+        })
+        .orElse(ResponseEntity.notFound().build());
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/CustomerController.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/CustomerController.java
new file mode 100644
index 0000000..b08f1df
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/CustomerController.java
@@ -0,0 +1,31 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.api;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.api.dto.LoyaltyPointsResponse;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.CustomerDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.usecase.CustomerUseCase;
+import java.util.Optional;
+import java.util.UUID;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/users")
+public class CustomerController {
+
+  private final CustomerUseCase customerUseCase;
+
+  public CustomerController(CustomerUseCase customerUseCase) {
+    this.customerUseCase = customerUseCase;
+  }
+
+  @GetMapping("/{id}/loyalty-points")
+  public ResponseEntity<LoyaltyPointsResponse> getLoyaltyPoints(@PathVariable UUID id) {
+    Optional<CustomerDTO> customer = customerUseCase.findCustomerById(id);
+    return customer
+        .map(c -> ResponseEntity.ok(new LoyaltyPointsResponse(c.getId().toString(), c.getLoyaltyPoints())))
+        .orElse(ResponseEntity.notFound().build());
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/FrontendBookMapper.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/FrontendBookMapper.java
new file mode 100644
index 0000000..c08d9c3
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/FrontendBookMapper.java
@@ -0,0 +1,67 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.api;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.api.dto.FrontendBookRequest;
+import fr.iut_fbleau.but3.dev62.mylibrary.api.dto.FrontendBookResponse;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDetails;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookSalesInfo;
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.concurrent.atomic.AtomicLong;
+
+public final class FrontendBookMapper {
+
+  private static final AtomicLong ISBN_SEQUENCE = new AtomicLong(System.nanoTime() % 1_000_000_000L);
+
+  private FrontendBookMapper() {}
+
+  public static String generateIsbn() {
+    long value = ISBN_SEQUENCE.incrementAndGet() % 10_000_000_000L;
+    return String.format("978%010d", value);
+  }
+
+  public static BookInfo toBookInfo(String isbn, FrontendBookRequest request) {
+    int safeYear = request.year() > 0 ? request.year() : LocalDate.now().getYear();
+    return new BookInfo(
+        isbn,
+        request.title().trim(),
+        request.author().trim(),
+        "Ma librairie",
+        LocalDate.of(safeYear, 1, 1));
+  }
+
+  public static BookSalesInfo toBookSalesInfo(FrontendBookRequest request) {
+    return BookSalesInfo.builder()
+        .price(request.price())
+        .stock(1)
+        .build();
+  }
+
+  public static BookDetails toBookDetails(FrontendBookRequest request) {
+    ArrayList<String> categories = new ArrayList<>();
+    String genre = request.genre() == null ? "" : request.genre().trim();
+    categories.add(genre.isBlank() ? "Général" : genre);
+    return BookDetails.builder()
+        .categories(categories)
+        .description("")
+        .language("fr")
+        .build();
+  }
+
+  public static FrontendBookResponse toResponse(BookDTO book, boolean read) {
+    int year = book.getDate() != null ? book.getDate().getYear() : LocalDate.now().getYear();
+    String genre = book.getCategories() == null || book.getCategories().isEmpty()
+        ? "Général"
+        : book.getCategories().getFirst();
+    return new FrontendBookResponse(
+        book.getIsbn(),
+        book.getTitle(),
+        book.getAuthor(),
+        year,
+        genre,
+        book.getPrice(),
+        read,
+        book.getStock() == null ? 0 : book.getStock());
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/HealthController.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/HealthController.java
new file mode 100644
index 0000000..e272233
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/HealthController.java
@@ -0,0 +1,16 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.api;
+
+import java.util.Map;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api")
+public class HealthController {
+
+  @GetMapping("/health")
+  public Map<String, String> health() {
+    return Map.of("status", "ok", "service", "mylibrary-backend");
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/FrontendBookRequest.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/FrontendBookRequest.java
new file mode 100644
index 0000000..3cfdb04
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/FrontendBookRequest.java
@@ -0,0 +1,10 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.api.dto;
+
+public record FrontendBookRequest(
+    String title,
+    String author,
+    int year,
+    String genre,
+    double price,
+    boolean read
+) {}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/FrontendBookResponse.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/FrontendBookResponse.java
new file mode 100644
index 0000000..1f24eee
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/FrontendBookResponse.java
@@ -0,0 +1,12 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.api.dto;
+
+public record FrontendBookResponse(
+    String id,
+    String title,
+    String author,
+    int year,
+    String genre,
+    double price,
+    boolean read,
+    int stock
+) {}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/LoyaltyPointsResponse.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/LoyaltyPointsResponse.java
new file mode 100644
index 0000000..4edb06b
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/api/dto/LoyaltyPointsResponse.java
@@ -0,0 +1,3 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.api.dto;
+
+public record LoyaltyPointsResponse(String userId, int points) {}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/usecase/BookUseCase.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/usecase/BookUseCase.java
index b59de47..301a79a 100644
--- a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/usecase/BookUseCase.java
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/book/usecase/BookUseCase.java
@@ -12,6 +12,7 @@ import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
 import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
 import fr.iut_fbleau.but3.dev62.mylibrary.book.validator.BookValidator;
 
+import java.util.List;
 import java.util.Optional;
 
 public class BookUseCase {
@@ -32,6 +33,12 @@ public class BookUseCase {
         return bookToRegistered.getIsbn();
     }
 
+    public List<BookDTO> findAllBooks() {
+        return bookRepository.findAll().stream()
+                .map(BookConverter::ToDTO)
+                .toList();
+    }
+
     public Optional<BookDTO> findBookByIsbn(String isbn) {
         Optional<Book> optionalBook = bookRepository.findByIsbn(isbn);
         return optionalBook.map(BookConverter::ToDTO);
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/AppConfig.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/AppConfig.java
new file mode 100644
index 0000000..069f1a6
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/AppConfig.java
@@ -0,0 +1,32 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.config;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.usecase.BookUseCase;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.repository.CustomerRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.usecase.CustomerUseCase;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AppConfig {
+
+  @Bean
+  BookRepository bookRepository() {
+    return new BookRepository();
+  }
+
+  @Bean
+  BookUseCase bookUseCase(BookRepository bookRepository) {
+    return new BookUseCase(bookRepository);
+  }
+
+  @Bean
+  CustomerRepository customerRepository() {
+    return new CustomerRepository();
+  }
+
+  @Bean
+  CustomerUseCase customerUseCase(CustomerRepository customerRepository) {
+    return new CustomerUseCase(customerRepository);
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/DemoDataLoader.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/DemoDataLoader.java
new file mode 100644
index 0000000..f154a80
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/DemoDataLoader.java
@@ -0,0 +1,74 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.config;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookDetails;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.BookSalesInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.exception.NotValidBookException;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.usecase.BookUseCase;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.CustomerInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.exception.NotValidCustomerException;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.usecase.CustomerUseCase;
+import java.time.LocalDate;
+import java.util.ArrayList;
+import org.springframework.boot.ApplicationArguments;
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+public class DemoDataLoader implements ApplicationRunner {
+
+  private final BookUseCase bookUseCase;
+  private final CustomerUseCase customerUseCase;
+
+  public DemoDataLoader(BookUseCase bookUseCase, CustomerUseCase customerUseCase) {
+    this.bookUseCase = bookUseCase;
+    this.customerUseCase = customerUseCase;
+  }
+
+  @Override
+  public void run(ApplicationArguments args) throws NotValidBookException, NotValidCustomerException {
+    if (!bookUseCase.findAllBooks().isEmpty()) {
+      return;
+    }
+
+    registerBook(
+        "9782070612758",
+        "Le Petit Prince",
+        "Antoine de Saint-Exupéry",
+        LocalDate.of(1943, 1, 1),
+        8.5,
+        "Conte");
+    registerBook(
+        "9782070368228",
+        "1984",
+        "George Orwell",
+        LocalDate.of(1949, 1, 1),
+        9.9,
+        "Science-fiction");
+
+    customerUseCase.registerCustomer(new CustomerInfo("Marie", "Dupont", "0612345678"));
+    customerUseCase.addLoyaltyPoints(
+        customerUseCase.findCustomerByPhoneNumber("0612345678").orElseThrow().getId(),
+        100);
+  }
+
+  private void registerBook(
+      String isbn,
+      String title,
+      String author,
+      LocalDate date,
+      double price,
+      String category)
+      throws NotValidBookException {
+    ArrayList<String> categories = new ArrayList<>();
+    categories.add(category);
+    bookUseCase.registerBook(
+        new BookInfo(isbn, title, author, "Gallimard", date),
+        BookSalesInfo.builder().price(price).stock(5).build(),
+        BookDetails.builder()
+            .categories(categories)
+            .description("")
+            .language("fr")
+            .build());
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/WebConfig.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/WebConfig.java
new file mode 100644
index 0000000..997ac65
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/config/WebConfig.java
@@ -0,0 +1,17 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+
+  @Override
+  public void addCorsMappings(CorsRegistry registry) {
+    registry.addMapping("/api/**")
+        .allowedOrigins("http://localhost:5173", "http://127.0.0.1:5173")
+        .allowedMethods("GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS")
+        .allowedHeaders("*");
+  }
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/customer/usecase/CustomerUseCase.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/customer/usecase/CustomerUseCase.java
index 3241c30..216320d 100644
--- a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/customer/usecase/CustomerUseCase.java
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/customer/usecase/CustomerUseCase.java
@@ -32,6 +32,10 @@ public final class CustomerUseCase {
     return optionalCustomer.map(CustomerConverter::toDTO);
   }
 
+  public Optional<CustomerDTO> findCustomerById(UUID uuid) {
+    return customerRepository.findById(uuid).map(CustomerConverter::toDTO);
+  }
+
   public CustomerDTO updateCustomer(UUID uuid, CustomerInfo customerInfo)
       throws CustomerNotFoundException, NotValidCustomerException {
     CustomerValidator.validate(customerInfo);
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100644
index 0000000..1a8b5e1
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1,2 @@
+server.port=8080
+spring.application.name=mylibrary