Than tradebait post forms of payment module magento?

Make a store on magento. Write extensions to payment gateway suit your needs. I have a method that post'om submits the form of a redirect.phtml the gateway address with a listing of content InputB, and me(the buyer regretting to part with $$$) redirects from checking out code to the same. So - something wrong or not is transmitted to the payment gateway and it is sad from this.

What would or how would I see which line (that it) is transmitted to the gateway? Than tradebait?