Go into your account, go to Settings -> Silent Post URL. Put in the URL (preferably with https) of a page on your site that you set up for this. Every time a transaction goes through now, this page will be sent a POST by Authorize.net, which can be accessed as follows (if you're using PHP):
<?php
require_once($_SERVER['DOCUMENT_ROOT'] . '/library/mysql.php');
// Want to log everything so we have an activity report
// in case something goes wrong with the code
$logfile = "{$_SERVER['DOCUMENT_ROOT']}/logs/callback.txt";
$handle = fopen($logfile, 'a');
// Eliminate fields we don't care about or don't want to
// include in the log
foreach (array('x_method', 'x_account_number', 'x_phone', 'x_fax', 'x_email', 'x_invoice_num', 'x_type', 'x_ship_to_first_name', 'x_ship_to_last_name', 'x_ship_to_company', 'x_ship_to_address', 'x_ship_to_city', 'x_ship_to_state', 'x_ship_to_zip', 'x_ship_to_country', 'x_tax', 'x_duty', 'x_freight', 'x_tax_exempt', 'x_po_num', 'x_cvv2_resp_code', 'x_cavv_response', 'x_test_request') as $key)
unset($_POST[$key]);
// Log remainder
fwrite($handle, print_r($_POST, true));
// 'payment_type' is a custom field I added to every AIM
// transaction so it's easy to identify which transactions
// are ARB. Probably be simpler for you to just mark the ARB
// subscriptions and test for that.
if ($_POST['payment_type'] != 'SINGLE') {
if (!$link = db_connect())
fwrite($handle, "Unable to connect to database.\n");
// x_cust_id is the customer record number in my db
elseif ($_POST['x_response_code'] == 1 && $_POST['x_cust_id']) {
$query = queryMysql("
INSERT INTO payments SET company = {company}, payment = {payment}, type = 'MONTHLY', paid = NOW()",
array(
company => $_POST['x_cust_id'],
payment => $_POST['x_amount']
));
if (!$result = mysql_query($query, $link))
fwrite($handle, "ERROR: Unable to add payment record to database.\n");
else
fwrite($handle, "Payment record added to database.\n");
// Just a quick representation of what you might do
// to update a subscription when payment comes through
$query = queryMysql("
UPDATE companies SET payment_due = payment_due + INTERVAL 1 MONTH WHERE idn = {company}",
array(
company => $_POST['x_cust_id']
));
if (!$result = mysql_query($query, $link))
fwrite($handle, "ERROR: Unable to update company expiration date.\n");
else
fwrite($handle, "Company expiration date updated.\n");
}
else fwrite($handle, "ERROR: No response code and/or customer ID.\n");
}
else fwrite($handle, "SKIPPED: Single payment, already added to database by submitting page.\n");
print 'complete';
?>
If you just want to see everything sent to the callback (relay response) page, use this instead and send through one transaction.
<?php
$logfile = "{$_SERVER['DOCUMENT_ROOT']}/logs/callback.txt";
$handle = fopen($logfile, 'a');
fwrite($handle, print_r($_POST, true));
?>
