Simulate reversal

Simulate an acquirer reversing the message that opened a card transaction, as with a voided sale or a terminal that never got its authorization response. The transaction must have started as an authorization or a full financial transaction.

Omit cardholder_amount to reverse in full: an authorization releases whatever hold the series still carries, including incremental authorizations, and a full financial transaction reverses its settled amount. Set cardholder_amount to release part of an authorization hold and leave the rest active, as with a partially filled order; partial reversals don't apply to full financial transactions.

Reversals act on the outstanding authorization hold, so a transaction that has already been captured has nothing left to reverse — refund it instead.

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