(PECL spplus >= 1.0.0) Obtain a hmac key (needs 8 arguments)
(PECL spplus >= 1.0.0) Obtain a nthmac key (needs 2 arguments)
(PECL spplus >= 1.0.0) Obtain a hmac key (needs 2 arguments)
(PECL spplus >= 1.0.0) Obtain the payment url (needs 2 arguments)