Recurring Transaction- A transaction for which permission has been granted by a cardholder to a merchant that is periodically charged to a cardholders account.
Release- When a merchant instructs a terminal to close a batch. Cardholders are not charged, or merchants credited until a batch is released.
Retrieval Request- A request to a merchant for documentation concerning a transaction, usually a cadholder dispute or a suspicious sale/return. A retrieval request can lead to a chargeback.