I am building a one page check out system for 600mg.com and originally set it up using formmail but have always needed it all to be on one page. The client is pushing for it now and I need some help. Mainly with formmail validation and php hooks im guessing...

What I need it to do is capture all the customers billing, shipping and payment info(especially a credit card) Validate it and and then i guess php hook into the merchant account script. This was my problem before because the payment gateway wanted the form action to be there script, but I needed it to be formmail so I could collect the info and validate it before submission.

Willing to pay for support , but if anyone has any ideas on how to get started greatly appreciated