Are you thinking of adding a Paypal buy now button in your website? Perhaps you already have a website
ready to accept credit card payment using Paypal. It would be a good idea to test your website before you
go public. There could be various reasons but I will point some of them bellow:
1. Make sure after user makes a payment they go to thank you page.
2. May be user is supposed to be able to download a file after he/she makes a payment.
3. What about storing transaction...