I want to use a simple form where user fills in name etc which is written to sql and a unique userid generated for them. This can all be triggered by hitting the Subscribe button at the end of the form, that part's easy!! But when they go off to PayPal I want their unique userid to go with them and then come back to the return url so I can automatically update the sql as 'paid'. This must be simple but I can't find any reference to passing unique variables to Paypal and then back to me!!
Any help much appreciated!!
