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PayPal IPN Snippet

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Source: http://net.tutsplus.com/tutorials/php/using-paypals-instant-payment-notification-with-php/

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  1. <?php
  2.  
  3. mysql_connect("localhost", "user", "password") or die(mysql_error());
  4. mysql_select_db("PayPal") or die(mysql_error());
  5.  
  6. // read the post from PayPal system and add 'cmd'
  7. $req = 'cmd=_notify-validate';
  8. foreach ($_POST as $key => $value) {
  9. $value = urlencode(stripslashes($value));
  10. $req .= "&$key=$value";
  11. }
  12. // post back to PayPal system to validate
  13. $header = "POST /cgi-bin/webscr HTTP/1.0
  14. ";
  15. $header .= "Content-Type: application/x-www-form-urlencoded
  16. ";
  17. $header .= "Content-Length: " . strlen($req) . "
  18.  
  19. ";
  20.  
  21. $fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);
  22.  
  23. if (!$fp) {
  24. // HTTP ERROR
  25. } else {
  26. fputs ($fp, $header . $req);
  27. while (!feof($fp)) {
  28. $res = fgets ($fp, 1024);
  29. if (strcmp ($res, "VERIFIED") == 0) {
  30.  
  31. // PAYMENT VALIDATED & VERIFIED!
  32.  
  33. }
  34.  
  35. else if (strcmp ($res, "INVALID") == 0) {
  36.  
  37. // PAYMENT INVALID & INVESTIGATE MANUALY!
  38.  
  39. }
  40. }
  41. fclose ($fp);
  42. }
  43. ?>

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