I'm using the Paypal integration class my micah carrick. I can't get the code in blue to work. Where am i going wrong ? What i aim to accomplish is : User will buy hits from my website, and after validating the IPN , the hits will be added to the database. <?php /* PHP Paypal IPN Integration Class Demonstration File * 4.16.2005 - Micah Carrick, email@micahcarrick.com * * This file demonstrates the usage of paypal.class.php, a class designed * to aid in the interfacing between your website, paypal, and the instant * payment notification (IPN) interface. This single file serves as 4 * virtual pages depending on the "action" varialble passed in the URL. It's * the processing page which processes form data being submitted to paypal, it * is the page paypal returns a user to upon success, it's the page paypal * returns a user to upon canceling an order, and finally, it's the page that * handles the IPN request from Paypal. * * I tried to comment this file, aswell as the acutall class file, as well as * I possibly could. Please email me with questions, comments, and suggestions. * See the header of paypal.class.php for additional resources and information. */ // Setup class require_once('paypal.class.php'); // include the class file $p = new paypal_class; // initiate an instance of the class $p->paypal_url = 'https://www.sandbox.paypal.com/cgi-bin/webscr'; // testing paypal url //$p->paypal_url = 'https://www.paypal.com/cgi-bin/webscr'; // paypal url // setup a variable for this script (ie: 'http://www.micahcarrick.com/paypal.php') $this_script = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF']; // if there is not action variable, set the default action of 'process' if (empty($_GET['action'])) $_GET['action'] = 'process'; switch ($_GET['action']) { case 'process': // Process and order... // There should be no output at this point. To process the POST data, // the submit_paypal_post() function will output all the HTML tags which // contains a FORM which is submited instantaneously using the BODY onload // attribute. In other words, don't echo or printf anything when you're // going to be calling the submit_paypal_post() function. // This is where you would have your form validation and all that jazz. // You would take your POST vars and load them into the class like below, // only using the POST values instead of constant string expressions. // For example, after ensureing all the POST variables from your custom // order form are valid, you might have: // $p->add_field('business', 'EMAIL'); $p->add_field('return', $this_script.'?action=success'); $p->add_field('cancel_return', $this_script.'?action=cancel'); $p->add_field('notify_url', $this_script.'?action=ipn'); $p->add_field('item_name', 'Paypal Test Transaction'); [COLOR="Blue"] $p->add_field('hitsbought', "$_GET[hits]"); $p->add_field('linkid', "$_GET[linkid]"); $p->add_field('userid', "$_GET[uid]");[/COLOR] $p->add_field('amount', 700); $p->submit_paypal_post(); // submit the fields to paypal $p->dump_fields(); // for debugging, output a table of all the fields break; case 'success': // Order was successful... // This is where you would probably want to thank the user for their order // or what have you. The order information at this point is in POST // variables. However, you don't want to "process" the order until you // get validation from the IPN. That's where you would have the code to // email an admin, update the database with payment status, activate a // membership, etc. echo "<html><head><title>Success</title></head><body><h3>Thank you for your order.</h3>"; foreach ($_POST as $key => $value) { echo "$key: $value<br>"; } echo "</body></html>"; // You could also simply re-direct them to another page, or your own // order status page which presents the user with the status of their // order based on a database (which can be modified with the IPN code // below). break; case 'cancel': // Order was canceled... // The order was canceled before being completed. echo "<html><head><title>Canceled</title></head><body><h3>The order was canceled.</h3>"; echo "</body></html>"; break; case 'ipn': // Paypal is calling page for IPN validation... // It's important to remember that paypal calling this script. There // is no output here. This is where you validate the IPN data and if it's // valid, update your database to signify that the user has payed. If // you try and use an echo or printf function here it's not going to do you // a bit of good. This is on the "backend". That is why, by default, the // class logs all IPN data to a text file. if ($p->validate_ipn()) { // Payment has been recieved and IPN is verified. This is where you // update your database to activate or process the order, or setup // the database with the user's order details, email an administrator, // etc. You can access a slew of information via the ipn_data() array. // Check the paypal documentation for specifics on what information // is available in the IPN POST variables. Basically, all the POST vars // which paypal sends, which we send back for validation, are now stored // in the ipn_data() array. // For this example, we'll just email ourselves ALL the data. include('./config.php'); [COLOR="Blue"] $adhits = $p->ipn_data['hits']; $uid = $p->ipn_data['userid']; mysql_query("insert into ads(target,hits_bought,owner) values('test','$adhits','$uid')");[/COLOR] } } ?> Code (markup):