none

a non recurring payment, i.e. a single authorization which might be captures at once or later in one or multiple charges

oneclick

a form of payment on which the cardholder is authenticated only on the initial transaction. Follow-up transactions are authorized without active interaction of the cardholder

recurring

a recurring payment, which has an a priori defined frequency and limit/threshold

installment

a recurring payment, which has an a priori defined frequency, limit/threshold and end date