send a copy of the checkout page please.
You need to add the full request and full response bindings to the page in addition to the other code on the page.
When I said that the full request and response will contain sensitive information i was referring to what will be on the page when you run it in the browser.
the output of the full request and full response will contain sensitive information.
before posting that out put to the forum for us to inspect, you will need to remove the sensitive details.