save hidden values in header after redirect

I have a form with 2 pages that retrieve information, that information is stored in my header file as hidden values. After the second page the user is directed to a third party payment开发者_如何学C system. Then they are redirected back to the third page of the form. However, my header does not have the hidden values anymore. how do i gain access to those values, as i do nee them for database purposes.

If the third party payment system you speak of is PayPal, there's a way to set values that they'll send back to you.

However, if the payment system does not have such an API, then I think you're out of luck. It would be their system that generates the headers that would come back to you. It's highly unlikely that their API wouldn't have a way to do it though.