I'm looking for a good tutorial for the Paypal API. Google isn't doing too well for me at the moment. Paypal's site does a terrible job of making this easy. I can't even find out how to link to their API. Bah. Any help would be appreciated! Thanks!
Use their sandbox. Their documentation is good and I think there's a PHP class that will do this for you.
Yes. Just do some searches on PayPal. Don't search PayPal API, search PayPal IPN. I found it all pretty easily several weeks ago when I decided to implement it on a site I was doing. Also, make sure you do all your testing through their handy little sandbox. Useful links: https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/library_documentation http://developer.paypal.com/