This is probably blasphemy around here, but if you've got a PHP script provided by the 3rd party (paytox) you're trying to use, why don't you just use the PHP script? You shouldn't make life any harder than it already is. Plus these paytox people should provide some technical support for their scripts, or you shouldn't use them in the first place.

Finally if you want to pay people to code, you should go somewhere else like expertsexchange, geekfinder.com or similar place.