diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderAddressInfo.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderAddressInfo.java
new file mode 100644
index 0000000..86a6d2a
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderAddressInfo.java
@@ -0,0 +1,9 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+public record OrderAddressInfo(
+    String street,
+    String city,
+    String postalCode,
+    String country
+) {
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderDTO.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderDTO.java
new file mode 100644
index 0000000..ae33548
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderDTO.java
@@ -0,0 +1,10 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+import java.util.UUID;
+
+public record OrderDTO(
+    UUID orderId,
+    double totalAmount,
+    int earnedLoyaltyPoints
+) {
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderInfo.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderInfo.java
new file mode 100644
index 0000000..9358ceb
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderInfo.java
@@ -0,0 +1,12 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+import java.util.List;
+import java.util.UUID;
+
+public record OrderInfo(
+    UUID customerId,
+    List<OrderLineInfo> orderLines,
+    OrderAddressInfo deliveryAddress,
+    PaymentMode paymentMode
+) {
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderLineInfo.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderLineInfo.java
new file mode 100644
index 0000000..b6c6c7d
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/OrderLineInfo.java
@@ -0,0 +1,7 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+public record OrderLineInfo(
+    String bookIsbn,
+    int quantity
+) {
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/PaymentMode.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/PaymentMode.java
new file mode 100644
index 0000000..c0e1060
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/PaymentMode.java
@@ -0,0 +1,7 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order;
+
+public enum PaymentMode {
+  CB,
+  PAYPAL,
+  POINTS_FIDELITE
+}
diff --git a/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/usecase/OrderUseCase.java b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/usecase/OrderUseCase.java
new file mode 100644
index 0000000..6fde73b
--- /dev/null
+++ b/src/main/java/fr/iut_fbleau/but3/dev62/mylibrary/order/usecase/OrderUseCase.java
@@ -0,0 +1,53 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.usecase;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.entity.Customer;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.exception.CustomerNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.repository.CustomerRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderLineInfo;
+import java.util.UUID;
+
+public final class OrderUseCase {
+
+  private final CustomerRepository customerRepository;
+  private final BookRepository bookRepository;
+
+  public OrderUseCase(CustomerRepository customerRepository, BookRepository bookRepository) {
+    this.customerRepository = customerRepository;
+    this.bookRepository = bookRepository;
+  }
+
+  public OrderDTO placeOrder(OrderInfo orderInfo) throws CustomerNotFoundException {
+    Customer customer = customerRepository.findById(orderInfo.customerId())
+        .orElseThrow(() -> new CustomerNotFoundException(orderInfo.customerId()));
+
+    double totalAmount = 0;
+    for (OrderLineInfo orderLine : orderInfo.orderLines()) {
+      Book book = bookRepository.findByIsbn(orderLine.bookIsbn())
+          .orElseThrow(() -> new IllegalArgumentException("Book not found"));
+      totalAmount += book.getPrice() * orderLine.quantity();
+      Book updatedBook = Book.builder()
+          .isbn(book.getIsbn())
+          .title(book.getTitle())
+          .author(book.getAuthor())
+          .publisher(book.getPublisher())
+          .categories(book.getCategories())
+          .description(book.getDescription())
+          .langue(book.getLangue())
+          .publicationDate(book.getPublicationDate())
+          .price(book.getPrice())
+          .stock(book.getStock() - orderLine.quantity())
+          .build();
+      bookRepository.save(updatedBook);
+    }
+
+    int earnedLoyaltyPoints = (int) totalAmount;
+    customer.addLoyaltyPoints(earnedLoyaltyPoints);
+    customerRepository.save(customer);
+
+    return new OrderDTO(UUID.randomUUID(), totalAmount, earnedLoyaltyPoints);
+  }
+}
diff --git a/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/order/usecase/OrderUseCaseTest.java b/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/order/usecase/OrderUseCaseTest.java
new file mode 100644
index 0000000..d399cd6
--- /dev/null
+++ b/src/test/java/fr/iut_fbleau/but3/dev62/mylibrary/order/usecase/OrderUseCaseTest.java
@@ -0,0 +1,90 @@
+package fr.iut_fbleau.but3.dev62.mylibrary.order.usecase;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import fr.iut_fbleau.but3.dev62.mylibrary.book.entity.Book;
+import fr.iut_fbleau.but3.dev62.mylibrary.book.repository.BookRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.entity.Customer;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.exception.CustomerNotFoundException;
+import fr.iut_fbleau.but3.dev62.mylibrary.customer.repository.CustomerRepository;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderAddressInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderDTO;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.OrderLineInfo;
+import fr.iut_fbleau.but3.dev62.mylibrary.order.PaymentMode;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class OrderUseCaseTest {
+
+  @Mock
+  private CustomerRepository customerRepository;
+
+  @Mock
+  private BookRepository bookRepository;
+
+  @InjectMocks
+  private OrderUseCase orderUseCase;
+
+  @Test
+  @DisplayName("Should place order and return expected amount and loyalty points")
+  void shouldPlaceOrderAndReturnExpectedAmountAndLoyaltyPoints() throws CustomerNotFoundException {
+    UUID customerId = UUID.randomUUID();
+    Customer customer = Customer.builder()
+        .id(customerId)
+        .firstName("Jane")
+        .lastName("Doe")
+        .phoneNumber("0612345678")
+        .loyaltyPoints(10)
+        .build();
+
+    Book cleanCode = Book.builder()
+        .isbn("9780132350884")
+        .title("Clean Code")
+        .author("Robert C. Martin")
+        .publisher("Prentice Hall")
+        .categories(List.of("Programming"))
+        .description("A handbook of agile software craftsmanship")
+        .langue("fr")
+        .price(40.0)
+        .stock(10)
+        .build();
+
+    OrderInfo orderInfo = new OrderInfo(
+        customerId,
+        List.of(new OrderLineInfo("9780132350884", 2)),
+        new OrderAddressInfo("1 rue de Paris", "Paris", "75000", "France"),
+        PaymentMode.CB
+    );
+
+    when(customerRepository.findById(customerId)).thenReturn(Optional.of(customer));
+    when(bookRepository.findByIsbn("9780132350884")).thenReturn(Optional.of(cleanCode));
+    when(bookRepository.save(any(Book.class))).thenAnswer(invocation -> invocation.getArgument(0));
+    when(customerRepository.save(any(Customer.class))).thenAnswer(invocation -> invocation.getArgument(0));
+
+    OrderDTO orderDTO = orderUseCase.placeOrder(orderInfo);
+
+    assertNotNull(orderDTO);
+    assertNotNull(orderDTO.orderId());
+    assertEquals(80.0, orderDTO.totalAmount());
+    assertEquals(80, orderDTO.earnedLoyaltyPoints());
+    assertEquals(90, customer.getLoyaltyPoints());
+    verify(customerRepository, times(1)).findById(customerId);
+    verify(bookRepository, times(1)).findByIsbn("9780132350884");
+    verify(bookRepository, times(1)).save(any(Book.class));
+    verify(customerRepository, times(1)).save(customer);
+  }
+}