So mResponse holds the return authorization id, transaction id, etc. Looks straight forward. Only thing is that they will only be doing low volume of transactions and the product is parking permits at a cost of $2.00 a night. For the non-pro version to take you to another site may be acceptable if its cheap enough and easy enough to implement.

I think a search over at verisign is needed to see the details on the non-pro version.

Thanks so far for the help. Anything other options out there? I saw that thread in VB.NET on the paypal apis but it looks like it also involves CGI scripting. What do you think of it?