i need paygistix payment gateway posting url

As I said last time you asked:

"Never, ever, accept code from a insecure website to handle anything to do with real money.
You do not know who is giving you the code, you do not know what it does, you do not know that it places the monies correctly into the appropriate account, without passing the details to any third parties.

Only get such code from paygistix - the scope for fraud otherwise is far too large. And remember, you personally could be liable for any monies lost if your action is seen to be negligent - which getting your code from a public forum would most certainly be!"

Contact the company - they aren't exactly hard to find - and ask them!
If you can't find the company, then I'm pretty sure you don't know enough to do the job with anything like sufficient security for real world customers...it took me one (single word) Google search!