Yet another blog

Integrating paypal to your site is easy, and they have a rich developer site to support your work. here are some links that will come handy

To start developing paypal related things first sign up in here
http://developer.paypal.com

From here you can create several dummy accounts of type business or personal and with any amount balance you wish.

Paypal also has an integration center which can help you integrate paypal with your site
https://www.paypal.com/IntegrationCenter/ic_home.html

From integration center you can get codes for buy now buttons, you can add shopping cart of your own or shopping cart provided by paypal and many more things.

During testing remember to change the different post data of paypal to this location
"https://sandbox.paypal.com" anywhere you find "https://www.paypal.com". And when you are done with testing make those to point to https://www.paypal.com

Paypals Instant Payment Notification is a great utility i found, it calls a script of you whenever a payment is made, then you can do processing like saving it in db or mailing info to somebody etc.

Enough for today