Am trying to create a way to setup the following:

1. User sends donation to paypal with info from donation site (name, email)
2. Paypal receives the donation and using the 2 variables it received (name, email) it sends them back to the donation site
3. Donation site receives variables and donation amount and changes some variables in the website to show that the user has donated some amount.

The site shows a list of users that have donated and how much they have donated which shows as points. How can I do this with paypal and php and mysql.