MERCHANT_RESPONSE_URL - HPP REFERENCE

[DanielMiara]

Hi,

I'm sorry but I can't see any place where I can ask for help.
I need to redirect a customer to the "thank you page " or "fail page" after the payment process.
Basically, all works fine except for the last step which should be the back to a store.

If I put some at the end of the script some redirect I got

"Your transaction has been successful but there was a problem connecting back to the merchant's web site. Please contact the merchant and advise them that you received this error message."

If there is no redirect the screen is white and no message.
How to notify the API where I want to redirect a customer?