A client-generated nonce which uniquely identifies some action to be executed. Subsequent requests with the same external ID do not execute the action again, but return the original result.
Invoice Merchant Reference
The merchant's reference used to identify the invoice.
Last Completion
Whether this is the final completion for the transaction, meaning no further completions can occur, and the transaction will move to its completed state upon success.
Line Items
The line items to be captured in the transaction completion.
Statement Descriptor
The statement descriptor that appears on a customer's bank statement, providing an explanation for charges or payments, helping customers identify the transaction.