(PECL spplus >= 1.0.0) Obtain the payment url (needs 2 arguments)

(PHP 4 >= 4.3.9, PHP 5 <= 5.0.5, PECL mcve >= 1.0.0) Number of transactions in client-queue

(PHP 4 >= 4.3.9, PHP 5 <= 5.0.5, PECL mcve >= 1.0.0) Check to see if a transaction has completed

(PHP 4 >= 4.3.9, PHP 5 <= 5.0.5, PECL mcve >= 1.0.0) Wait x microsecs

(PHP 4 >= 4.3.9, PHP 5 <= 5.0.5, PECL mcve >= 1.0.0) Set the connection method to SSL

(PECL spplus >= 1.0.0) Obtain a hmac key (needs 2 arguments)

(PHP 4 >= 4.3.9, PHP 5 <= 5.0.5, PECL mcve >= 1.0.0) Get a specific cell from a comma delimited response

(PHP 4 >= 4.3.9, PHP 5 <= 5.0.5, PECL mcve >= 1.0.0) Start a new transaction

(PHP 4 >= 4.3.9, PHP 5 <= 5.0.5, PECL mcve >= 1.0.0) Get a specific cell from a comma delimited response

(PHP 4 >= 4.3.9, PHP 5 <= 5.0.5, PECL mcve >= 1.0.0) Free memory associated with IP/SSL connectivity