Transaction UseVoucher

Authentication mode: Checked (known user, must have the privilege)

Database access mode: updating

Use a voucher to pay for an order. The system automatically deducts as much as is due for the order or as much as is left on the voucher - whichever is lower. If the voucher is not paid for the transaction will fail. The transaction will never transfer money from an order back to the voucher.

Inputs:

• orderid: int
  ID of the order that is to be paid for
• voucherid: astring
  ID of the voucher that is to be used for payment

Outputs:

• order: Order
  The full order object after the transaction
• voucher: Voucher
  The full voucher object after the transaction
• amount: int
  The amount that was deducted