Payment types

Payment type	Request parameter	Description
Debit	`DB`	Debits the customer account and credits the merchant account.
Credit	`CD`	Credits the customer account and debits the merchant account.
Refund	`RF`	Credits the customer account referencing a prior debit or capture transaction. Can be partial or full.
Reversal	`RV`	Reverses an already processed preauthorisation transaction.
Preauthorisation	`PA`	A stand-alone authorisation that triggers optional risk management and validation. A capture referencing the preauthorisation confirms the payment.
Capture	`CP`	Captures a preauthorised amount.
Registration	`RG`	Registers a card which you can then charge on a recurring basis using the registration token.

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For details on when to use a refund and when to use a reversal, see the support knowledge base.