=item * action
What to do with the transaction (currently available are: Normal
-Authorization, Authorization Only, Credit, Post Authorization)
+Authorization, Authorization Only, Credit, Post Authorization,
+Recurring Authorization, Modify Recurring Authorization,
+Cancel Recurring Authorization)
=item * description
=item * card_number
-Credit card number (obviously not required for non-credit card
-transactions).
+Credit card number.
=item * cvv2
=item * expiration
-Credit card expiration (obviously not required for non-credit card
-transactions).
+Credit card expiration.
+
+=item * track1
+
+Track 1 on the magnetic stripe (Card present only)
+
+=item * track2
+
+Track 2 on the magnetic stripe (Card present only)
=item * recurring billing
=item * account_type
-Account type for electronic checks or electronic funds transfer.
+Account type for electronic checks or electronic funds transfer. Can be
+(case-insensitive): B<Personal Checking>, B<Personal Savings>,
+B<Business Checking> or B<Business Savings>.
=item * account_name
=back
+=head3 RECURRING BILLING FIELDS
+
+=over 4
+
+=item * interval
+
+Interval expresses the amount of time between billings: digits, whitespace
+and units (currently "days" or "months" in either singular or plural form).
+
+=item * start
+
+The date of the first transaction (used for processors which allow delayed
+start) expressed as YYYY-MM-DD.
+
+=item * periods
+
+The number of cycles of interval length for which billing should occur
+(inclusive of 'trial periods' if the processor supports recurring billing
+at more than one rate)
+
+=back
+
=head2 submit();
Submit the transaction to the processor for completion