The PaymentExpress back-office application allows users to initiate voids and refunds of card transactions. A void is a same-day reversal that stops money from moving. A refund is an after-same-day reversal that returns money to the cardholder. Your system of record can use the Reversals API to initiate voids and refunds in real-time using the paymentId of the transaction. Any void or refund actions will be reflected in your elected Post-Payment Operations.
Payment-level reversals always reverse the entire payment amount. The amount field in the request body does not control how much is reversed - it is used only for validation to ensure mutual understanding between systems about the reversal amount. When omitted, a full reversal is performed without validation. When provided, the value must match the current payment balance or the request will fail.
