For all of your triggers you have:
if ((isset($_POST["Payment_submit_x"]) || isset($_POST["Payment_submit_x"])))
they should be:
if ((isset($_POST["Payment_submit"]) || isset($_POST["Payment_submit_x"])))
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.