PayPal IPN

[Ciwan]

Hi Guys

 

I thought enabling PayPal IPN would be a simple tick option in PayPal settings or something similar ! I did not know it would be so complex as coding stuff.

 

I am a beginner PHP programmer, and I can not program the IPN. I checked on PayPal and I see they have a template. Which parts do I need to change ? also is there anything that I need to add/remove from the template ?

 

<?php 
error_reporting(E_ALL ^ E_NOTICE); 
$email = $_GET['ipn_email']; 
$header = ""; 
$emailtext = ""; 

// Read the post from PayPal and add 'cmd' 
$req = 'cmd=_notify-validate'; 
if(function_exists('get_magic_quotes_gpc')) 
 { $get_magic_quotes_exits = true;} 
foreach ($_POST as $key => $value) 
 // Handle escape characters, which depends on setting of magic quotes 
 { if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) 
   {  $value = urlencode(stripslashes($value)); 
 } else { 
   $value = urlencode($value); 
 }  
 $req .= "&$key=$value";  
} 
// Post back to PayPal to validate 
$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n"; 
$header .= "Content-Type: application/x-www-form-urlencoded\r\n"; 
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n"; 
$fp = fsockopen ('www.paypal.com', 80, $errno, $errstr, 30); 

// Process validation from PayPal 
if (!$fp) { // HTTP ERROR  
} else { 
// NO HTTP ERROR  
fputs ($fp, $header . $req); 
while (!feof($fp)) { 
 $res = fgets ($fp, 1024); 
 if (strcmp ($res, "VERIFIED") == 0) { 
   // TODO: 
   // Check the payment_status is Completed 
   // Check that txn_id has not been previously processed 
   // Check that receiver_email is your Primary PayPal email 
   // Check that payment_amount/payment_currency are correct 
   // Process payment 

   // If 'VERIFIED', send an email of IPN variables and values to the 
   // specified email address 
   foreach ($_POST as $key => $value){ 
     $emailtext .= $key . " = " .$value ."\n\n"; 
   } 
   mail($email, "Live-VERIFIED IPN", $emailtext . "\n\n" . $req); 
 } else if (strcmp ($res, "INVALID") == 0) { 
   // If 'INVALID', send an email. TODO: Log for manual investigation. 
   foreach ($_POST as $key => $value){ 
     $emailtext .= $key . " = " .$value ."\n\n"; 
   } 
   mail($email, "Live-INVALID IPN", $emailtext . "\n\n" . $req); 
 } 
} 
fclose ($fp); 
?> 

 

I would greatly appreciate any help.

 

Thank You.

[WHMCS John]

It is just a case of ticking a checkbox as we've done the coding part for you! http://wiki.whmcs.com/PayPal

[Ciwan]

Hi John

 

Thank You, I did a google search of IPN on PayPal and I got the above.

 

So that is it now ? that is all I have to do ?

[WHMCS John]

Yup, that's all there is to it; always check our documentation