Contains a series of required and optional elements
Note: One of the following fields must be provided:
- CardData
- ClientTxnId
- GatewayTxnId
If more than one of these is provided, they must reference the same original transaction or payment information.
Note: Always run reversals with either GatewayTxnId or ClientTxnId. If only CardData is used the results are not guaranteed as the original transaction may not be uniquely identified.