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<?php
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/* PHP Paypal IPN Integration Class Demonstration File
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* 4.16.2005 - Micah Carrick, email@micahcarrick.com
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*
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* This file demonstrates the usage of paypal.class.php, a class designed
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* to aid in the interfacing between your website, paypal, and the instant
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* payment notification (IPN) interface. This single file serves as 4
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* virtual pages depending on the "action" varialble passed in the URL. It's
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* the processing page which processes form data being submitted to paypal, it
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* is the page paypal returns a user to upon success, it's the page paypal
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* returns a user to upon canceling an order, and finally, it's the page that
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* handles the IPN request from Paypal.
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*
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* I tried to comment this file, aswell as the acutall class file, as well as
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* I possibly could. Please email me with questions, comments, and suggestions.
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* See the header of paypal.class.php for additional resources and information.
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*/
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// Setup class
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require_once('paypal.class.php'); // include the class file
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$p = new paypal_class; // initiate an instance of the class
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$p->paypal_url = 'https://www.sandbox.paypal.com/cgi-bin/webscr'; // testing paypal url
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//$p->paypal_url = 'https://www.paypal.com/cgi-bin/webscr'; // paypal url
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// setup a variable for this script (ie: 'http://www.micahcarrick.com/paypal.php')
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$this_script = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];
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// if there is not action variable, set the default action of 'process'
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if (empty($_GET['action'])) $_GET['action'] = 'process';
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switch ($_GET['action']) {
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case 'process': // Process and order...
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// There should be no output at this point. To process the POST data,
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// the submit_paypal_post() function will output all the HTML tags which
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// contains a FORM which is submited instantaneously using the BODY onload
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// attribute. In other words, don't echo or printf anything when you're
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// going to be calling the submit_paypal_post() function.
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// This is where you would have your form validation and all that jazz.
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// You would take your POST vars and load them into the class like below,
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// only using the POST values instead of constant string expressions.
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// For example, after ensureing all the POST variables from your custom
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// order form are valid, you might have:
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//
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// $p->add_field('first_name', $_POST['first_name']);
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// $p->add_field('last_name', $_POST['last_name']);
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$p->add_field('business', 'YOUR PAYPAL (OR SANDBOX) EMAIL ADDRESS HERE!');
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$p->add_field('return', $this_script.'?action=success');
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$p->add_field('cancel_return', $this_script.'?action=cancel');
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$p->add_field('notify_url', $this_script.'?action=ipn');
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$p->add_field('item_name', 'Paypal Test Transaction');
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$p->add_field('amount', '1.99');
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$p->submit_paypal_post(); // submit the fields to paypal
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//$p->dump_fields(); // for debugging, output a table of all the fields
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break;
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case 'success': // Order was successful...
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// This is where you would probably want to thank the user for their order
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// or what have you. The order information at this point is in POST
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// variables. However, you don't want to "process" the order until you
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// get validation from the IPN. That's where you would have the code to
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// email an admin, update the database with payment status, activate a
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// membership, etc.
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echo "<html><head><title>Success</title></head><body><h3>Thank you for your order.</h3>";
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foreach ($_POST as $key => $value) { echo "$key: $value<br>"; }
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echo "</body></html>";
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// You could also simply re-direct them to another page, or your own
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// order status page which presents the user with the status of their
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// order based on a database (which can be modified with the IPN code
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// below).
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break;
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case 'cancel': // Order was canceled...
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// The order was canceled before being completed.
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echo "<html><head><title>Canceled</title></head><body><h3>The order was canceled.</h3>";
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echo "</body></html>";
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break;
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case 'ipn': // Paypal is calling page for IPN validation...
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// It's important to remember that paypal calling this script. There
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// is no output here. This is where you validate the IPN data and if it's
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// valid, update your database to signify that the user has payed. If
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// you try and use an echo or printf function here it's not going to do you
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// a bit of good. This is on the "backend". That is why, by default, the
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// class logs all IPN data to a text file.
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if ($p->validate_ipn()) {
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// Payment has been recieved and IPN is verified. This is where you
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// update your database to activate or process the order, or setup
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// the database with the user's order details, email an administrator,
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// etc. You can access a slew of information via the ipn_data() array.
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// Check the paypal documentation for specifics on what information
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// is available in the IPN POST variables. Basically, all the POST vars
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// which paypal sends, which we send back for validation, are now stored
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// in the ipn_data() array.
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// For this example, we'll just email ourselves ALL the data.
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$subject = 'Instant Payment Notification - Recieved Payment';
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$to = 'YOUR EMAIL ADDRESS HERE'; // your email
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$body = "An instant payment notification was successfully recieved\n";
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$body .= "from ".$p->ipn_data['payer_email']." on ".date('m/d/Y');
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$body .= " at ".date('g:i A')."\n\nDetails:\n";
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foreach ($p->ipn_data as $key => $value) { $body .= "\n$key: $value"; }
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mail($to, $subject, $body);
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}
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break;
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}
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?>
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