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I have a php site with a member system, and set up a paypal donations page. I’ve got the IPN just about working, it currently adds payments to a database.
What I want to do, is make it so when the user clicks the ‘DONATE’ button that takes them to paypal, it also sends the users username (from my site) over too. I want this username to make it through and come out the other side to the IPN script.
How can I do this?
Do i add &user=$username to the paypal URL or something?
Is this what you are looking for?
Record Keeping with Passthrough Variables
Some variables are exclusively for your own use, such as order management. PayPal returns the values that you send through Instant Payment Notification exactly as you sent them. For this reason, they are called passthrough variables. Their values are not recorded or used by PayPal.
The following are passthrough variables:
https://cms.paypal.com/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_html_formbasics