Paypal IPN Verification Postback with HTTPS

hostname

If OpenSSL support is installed, you may prefix the hostname with either ssl:// or tls:// to use an SSL or TLS client connection over TCP/IP to connect to the remote host.

http://www.php.net/fsockopen

The port would also need to change to 443. So:

$header .= "Host: www.paypal.com\r\n";
...
$fp = fsockopen('ssl://www.paypal.com', 443, $errno, $errstr, 30);
...
fputs ($fp, $header . $req);

https:// would not work because you’re opening a socket, which is a low-level transport. HTTP is an application level protocol on top of that, which the socket doesn’t know or care about. At the socket level it’s a TLS connection.

Also, is the fact my shop website is not HTTPS a problem, will this connection be refused?

What kind of connection a browser has to your server is irrelevant and nobody knows that. You’re opening a socket from a PHP program to Paypal, you may as well be doing that directly from the command line without any “HTTP” connection involved at all.

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