that I already have a site with users
, whose names and passwords along with other data are already stored to a mySQL database
One day I decide that I want to expand that site
, but require payment for existing users
in order to give them access to the new pages. I use PayPal
in order to accept payments, in order to confirm that someone has already donated I use ipn.php which connects directly to PayPal
to know which user payed, and I am not able to update the row of the user, so they would not get what they payed for. How can I pass data to PayPal in order to recognize who payed?