=item Credit
+=item Tokenize
+
=item Recurring Authorization
=item Modify Recurring Authorization
=back
+=head3 FOLLOW-UP TRANSACTION FIELDS
+
+These fields are used in follow-up transactions related to an original
+transaction (Post Authorization, Reverse Authorization, Void, Credit).
+
+=over 4
+
+=item authorization
+
+=item order_number
+
+=item txn_date
+
+=back
+
=head3 RECURRING BILLING FIELDS
=over 4
=head2 txn_date()
Transaction date, as returned by the gateway. Required by some gateways
-for follow-up transactions.
+for follow-up transactions. Store this if you would like to run inquiries or
+refunds on the transaction later.
=head2 fraud_score()