diff --git a/internal/contract/order_contract.go b/internal/contract/order_contract.go
index 59fa1ae..028dfc4 100644
--- a/internal/contract/order_contract.go
+++ b/internal/contract/order_contract.go
@@ -185,7 +185,7 @@ type CreatePaymentRequest struct {
 
 type CreatePaymentOrderItemRequest struct {
 	OrderItemID uuid.UUID `json:"order_item_id" validate:"required"`
-	Amount      float64   `json:"amount" validate:"required,min=0"`
+	Amount      float64   `json:"amount" validate:"min=0"`
 }
 
 type PaymentResponse struct {