}
=item update_customer
-Updates an existing customer. Passing an empty value clears that field, while NOT passing that key/value at all leaves it alone.
-Takes a hash reference as parameter with the following keys:
+
+Updates an existing customer. Passing an empty value clears that field, while
+NOT passing that key/value at all leaves it alone. Takes a list of keys and
+values as parameters with the following keys:
=over 4
=item invoicing_list
-comma-separated list of email addresses for email invoices. The special value '$
+Comma-separated list of email addresses for email invoices. The special value
+'POST' is used to designate postal invoicing (it may be specified alone or in
+addition to email addresses),
postal_invoicing
Set to 1 to enable postal invoicing
=item payinfo
-Card number for CARD/DCRD, account_number@aba_number for CHEK/DCHK, prepaid "pi$
+Card number for CARD/DCRD, account_number@aba_number for CHEK/DCHK, prepaid
+"pin" for PREPAY, purchase order number for BILL
=item paycvv