Well I am working on a site that basically accepts PayPal payments to give their accounts a premium status, don't need to get into exact details of what it does but what I am trying to accomplish is to have a "Pay Now with PayPal" button that will accept the payment then bounce them back to my site with some kind of verification code so I can say "Okay, paid let me run this code to set your account to premium"
Any idea how I can do this? I can specify a success URL but it requires a user to click a button saying "Return to *" after they pay and even that gives them a scary warning message.