
In my sandbox setup, i have API username, API password and API Signature.
can you tell me how these fields correspond to my USER VENDOR and PASSWORD fields in my confirm page ?
Regards

Craig,
The user and vendor information comes from your sign-up to a Pro account as far as I am aware the API stuff is for express checkout which can be used with a standard business PayPal account.
In fact a quick google search leads me to believe that there is no sandbox facility for testing UK PayPal Pro.