diff --git a/src/app/pages/cart/cart.component.ts b/src/app/pages/cart/cart.component.ts
index cf00c2e..77ec385 100644
--- a/src/app/pages/cart/cart.component.ts
+++ b/src/app/pages/cart/cart.component.ts
@@ -424,7 +424,6 @@ export class CartComponent implements OnDestroy {
         productId: String(item.itemID),
         name: item.name,
         quantity: item.quantity,
-        price: item.discount > 0 ? item.price * (1 - item.discount / 100) : item.price,
       })),
       customer: {
         name: this.getTelegramUsername() || this.i18n.t('common.guest'),
diff --git a/src/app/services/api.service.ts b/src/app/services/api.service.ts
index 30b1b01..1a9377f 100644
--- a/src/app/services/api.service.ts
+++ b/src/app/services/api.service.ts
@@ -54,7 +54,12 @@ export interface CartPaymentRequest {
 }
 
 export interface CreateOrderRequest {
-  items: Array<{ productId: string; name: string; quantity: number; price: number }>;
+  /**
+   * No `price` field: the backend must price each line item from its own
+   * catalog by `productId`, never trust a client-supplied amount.
+   * See BACKEND-API-REFERENCE.md §12.
+   */
+  items: Array<{ productId: string; name: string; quantity: number }>;
   customer: { name: string; email: string; phone: string };
   payment?: { method: string; currency: string };
   shipping?: { address: string; method: string; trackingNumber: string };