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PayPal IPN Shell

/ Published in: PHP
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This is a basic shell for PayPal IPN.
It is by no means a complete solution, but it should provide a good starting point for anyone that wants to work out IPN.
Or it can be used as is to do basic IPN.

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Copy this code and paste it in your HTML 
  1. <?php
  2. $req = 'cmd=_notify-validate';
  3. foreach ($_POST as $key => $value) {
  4. 	$value = urlencode(stripslashes($value));
  5. 	$req .= "&$key=$value";
  6. }
  7. $header .= "POST /cgi-bin/webscr HTTP/1.0
  8. ";
  9. $header .= "Host: www.paypal.com:80
  10. ";
  11. // $header .= "Host: www.sandbox.paypal.com:80
  12. ";
  13. $header .= "Content-Type: application/x-www-form-urlencoded
  14. ";
  15. $header .= "Content-Length: " . strlen($req) . "
  16.  
  17. ";
  18. $fp = fsockopen ('www.paypal.com', 80, $errno, $errstr, 30);
  19. // $fp = fsockopen ('www.sandbox.paypal.com', 80, $errno, $errstr, 30);
  20. if (!$fp) {
  21. 	// Do some code when your server cannot communicate with PayPal!
  22. 	mail('[email protected]', 'IPN ERROR', "HTTP ERROR\n\n" . $res);
  23. } else {
  24. 	fputs ($fp, $header . $req);
  25. 	while (!feof($fp)) {
  26. 		$res = fgets ($fp, 1024);
  27. 			if (strcmp ($res, "VERIFIED") == 0) {
  28. 				if ($_POST['payment_status'] == 'Completed') {
  29. 					// Do some code when PayPal returns payment completed status!
  30. 					foreach ($_POST as $key => $value){
  31. 						$emailtext .= $key . ": " . $value . "\n";
  32. 					}
  33. 					mail('[email protected]', "IPN VARIABLES", $emailtext . "\n\nREQUEST STRING:\n" . $req);
  34. 				} else {
  35. 					// Do some code when PayPal returns a different status!
  36. 					foreach ($_POST as $key => $value) {
  37. 						$emailtext .= $key . ": " . $value . "\n";
  38. 				}
  39. 				mail('[email protected]', "IPN VARIABLES", $emailtext . "\n\nREQUEST STRING:\n" . $req);
  40. 			}
  41. 		} elseif (strcmp ($res, "INVALID") == 0) {
  42. 			// Do some code when PayPal returns some error!
  43. 			foreach ($_POST as $key => $value){
  44. 				$emailtext .= $key . ": " . $value . "\n";
  45. 			}
  46. 			mail('[email protected]', "IPN VARIABLES", $emailtext . "\n\nREQUEST STRING:\n" . $req);
  47. 		}
  48. 	}
  49. fclose ($fp);
  50. }
  51. ?>

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