public function __construct($applicationprofileid, $merchantprofileid, $workflowid, $isTestAccount, $identitytoken = null, $sessiontoken = null)
{
$this->connection = VelocityConnection::instance();
// VelocityConnection class object store in private data member $connection.
self::$identitytoken = $identitytoken;
self::$applicationprofileid = $applicationprofileid;
self::$merchantprofileid = $merchantprofileid;
self::$workflowid = $workflowid;
self::$isTestAccount = $isTestAccount;
if (empty($sessiontoken) && !empty($identitytoken)) {
$this->sessionToken = $this->connection->signOn();
} else {
$this->sessionToken = $sessiontoken;
}
}