Any transaction can be refunded either partially or fully. To refund only a part of the payment, use the parameter partial_amount.
Note: Max two refunds per transaction!
If a transaction is partially refunded, it's not possible to issue another partial refund, unless the amount matches exactly the remaining amount. In other words, a transaction can only be refunded twice, once with a partial amount and again with the full (remaining) amount. The refund cannot be split it three or more parts.
SEPA and refunds
Refunds for SEPA transactions should not be issued. Learn more