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Paypal IPN : Custom Fields ?

Discussion in 'PHP' started by domainsurfer, Nov 28, 2008.

  1. #1
    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 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
    		 $p->dump_fields();      // for debugging, output a table of all the fields
       case 'success':      // Order was successful...
          // This is where you would probably want to thank the user for their order
          // or what have you.  The order information at this point is in POST 
          // variables.  However, you don't want to "process" the order until you
          // get validation from the IPN.  That's where you would have the code to
          // email an admin, update the database with payment status, activate a
          // membership, etc.  
          echo "<html><head><title>Success</title></head><body><h3>Thank you for your order.</h3>";
          foreach ($_POST as $key => $value) { echo "$key: $value<br>"; }
          echo "</body></html>";
          // You could also simply re-direct them to another page, or your own 
          // order status page which presents the user with the status of their
          // order based on a database (which can be modified with the IPN code 
          // below).
       case 'cancel':       // Order was canceled...
          // The order was canceled before being completed.
          echo "<html><head><title>Canceled</title></head><body><h3>The order was canceled.</h3>";
          echo "</body></html>";
       case 'ipn':          // Paypal is calling page for IPN validation...
          // It's important to remember that paypal calling this script.  There
          // is no output here.  This is where you validate the IPN data and if it's
          // valid, update your database to signify that the user has payed.  If
          // you try and use an echo or printf function here it's not going to do you
          // a bit of good.  This is on the "backend".  That is why, by default, the
          // class logs all IPN data to a text file.
          if ($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.
    		[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):
    domainsurfer, Nov 28, 2008 IP
  2. harrisunderwork

    harrisunderwork Well-Known Member

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    These are the custom fields send back by paypal so that u can process it.
    harrisunderwork, Nov 28, 2008 IP
  3. lucassoberano

    lucassoberano Peon

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    I have the same problem! Could you fix it?

    lucassoberano, Jan 26, 2010 IP
  4. feha

    feha Active Member

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    you can pass just one custom field value to IPN

    it is named "custom" ...
    feha, Jan 27, 2010 IP