$payment->setParameter("x_ship_to_last_name", $a['card_name_last']);
$payment->setParameter("x_ship_to_address", $a['address']);
$payment->setParameter("x_ship_to_city", $a['city']);
$payment->setParameter("x_ship_to_state", $a['state']);
$payment->setParameter("x_ship_to_zip", $a['zipcode']);
$payment->setParameter("x_description", 'Occasions Initial Authorization');
//$payment->setParameter("x_test_request", TRUE);
$payment->process();
if ($payment->isApproved()) {
// Get info from Authnet to store in the database
$authorization_code = $payment->getAuthCode();
$avs_result = $payment->getAVSResponse();
// not saved at this time
$cvv_result = $payment->getCVVResponse();
// not saved at this time
$transaction_id = $payment->getTransactionID();
// Do stuff with this.
//$err[] = "Amount: $auth_total";
//$err[] = "Invoice #: $invoice";
//$err[] = "Auth Code: $approval_code";
//$err[] = "AVS Result: $avs_result";
//$err[] = "CVV Result: $cvv_result";
//$err[] = "Transaction ID: $transaction_id";
// TODO: in case of errors, email the above info to the admin
// *******************************************************************
// NOW WE CAN SET UP THE RECURRING BILLING SUBSCRIPTION
// *******************************************************************
$arb = new AuthnetARB();
// Set recurring billing variables
$arb->setParameter('interval_length', $subscription_length);
$arb->setParameter('interval_unit', $subscription_unit);