Add order items

internal/service/order_service.go

@@ -449,17 +449,17 @@ func (s *OrderServiceImpl) validateSplitBillRequest(req *models.SplitBillRequest
 			return fmt.Errorf("items are required when splitting by ITEM")
 		}
 
-		totalItemAmount := float64(0)
+		totalItemAmount := 0
 		for i, item := range req.Items {
 			if item.OrderItemID == uuid.Nil {
 				return fmt.Errorf("order item ID is required for item %d", i+1)
 			}
 
-			if item.Amount <= 0 {
-				return fmt.Errorf("amount must be greater than zero for item %d", i+1)
+			if item.Quantity <= 0 {
+				return fmt.Errorf("quantity must be greater than zero for item %d", i+1)
 			}
 
-			totalItemAmount += item.Amount
+			totalItemAmount += item.Quantity
 		}
 
 		if totalItemAmount <= 0 {