i am thinking of integrating paypal into my clients website however wanted to check about a few things that i couldn't find in the documentation. I already have a working login system that starts a session upon logging in however my client wants the ability to give certain customers discounts. The discount amount can be manually added to the SQL database used for login (kept on PHPmyadmin) however is there any way for at checkout Paypal to take this value and subtract that percent form the total amount to be paid?
Many Thanks
Tom