Cancels the given payment. Only works if it has not been paid already.
Collects a payment of the given reserved payment.
Confirms the given payment.
Confirms a payment reservations. This just reserves/freezes the funds, it does NOT move any money yet.
Refunds the given payment.
Starts a payment with the given method and data.
Starts a payment reservation.
Validates the given data of the given payment method.
Interface for a payment service.