I have this PayPal payment button: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=SWKPMXU4DK7NS After payment, I want people to be redirected to a page where it has their account details ready. To do that, I need PayPal to give me their PayPal address. (send it to the thankyou page I have it redirected to.) Any ideas? Any help is appreciated - thanks!
To do this, you'll need to use paypal ipn (instant payment notification). There's lots of tutorials on it all around the internet but it can be a little tricky get working right. Basically whenever somebody makes a payment, paypal will run a script on your site (and pass you a lot of information about the specific transaction) that you can use the update a database or something with their information. So then your website already has all their info when they come back to the page.
I recommend using the express checkout method. It is the only way to guarantee the visitor ends up back on your site to complete the process.