Is it possible to send POST data with a PHP redirect?

Question

Update: This is NOT a duplicate of How do I send a POST request with PHP?. The solutions there don\'t work for me, they just output the result of the request, I don\'t w

Answer 1

AJAX could be use in this case.

The form on mysite.com/pay points to gatewaysite. On submit you run a function which will call script.php. Only if script.php confirms that the data is correct, the form will be submitted.