function wpsc_register_payment_gateway_file($file)
{
    return WPSC_Payment_Gateways::register_file($file);
}
function pbci_auth_register_gateway_file($gateway_controller)
{
    $gateway_file = dirname(__FILE__) . '/Authorize_Net_Credit_Card.php';
    WPSC_Payment_Gateways::register_file($gateway_file);
}