OperationServiceExtensionsAddPaymentItem Method | 
| Name | Description | |
|---|---|---|
| AddPaymentItem(IOperationService, Decimal, IPaymentItemAdditionalData, IPaymentType, IOrder, ICredentials) | Add new payment item to order.  | |
| AddPaymentItem(IOperationService, Guid, Decimal, IPaymentItemAdditionalData, IPaymentType, IOrder, ICredentials) | Add new payment item to order.  |