@andy_unleash > Is the paypal button going to be the submit button for the form?
Exactly, this is what I need.
And I found a paypal terminal script already made on codecanyon: [paypal terminal ](http://www.rxnk.com/scripts/paypal/index_hard.php “Paypal terminal “)
So, probably what I need to do is to integrate the ” pay” button from the terminal into “submit” button of the form…
Yes, there is a plugin from jquery called jquery validation (http://docs.jquery.com/Plugins/Validation). If you want only the buy button to show after they type correctly, you can validate their input when they start typing. Hope it helps. No need to pay for this thing. Hope it helps.