The type of payment flow that generated the transaction.
Allowed values are: one-off, recurring, recurring-standing-order, recurring-subscription, installment, unscheduled, unscheduled-delayed-charge, unscheduled-resubmission, unscheduled-no-show or unscheduled-reauthorization.
This field should be used in combination with the initiation_type field to tag scenarios such as initial CIT of a recurring sequence.