I have a full automatic notification system running on my web page, this is a simple PHP script that looks for emails in the database and then sends an email to each of them, all with Cronjob. The fact is that now I want to turn my free service into a paid one. I want to use PayPal, for a while I use it for donations, but now I want it to make monthly payments, and every time a user pays a month, a new value is entered into the database, so the PHP script can know if the user is paying or not to send or not send a letter.
I know how to use the monthly payment system in PayPal, but I can not find any tutorials on how to integrate the PayPal verification process into my custom php script to automatically know when my users are paying and then perform the modification in MySQL. Thanks
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