Paypal Recurring Charges signup form PHP

I am selling web based software that I want people to sign up for monthly service. When they sign up, I want to save their username/pword/address into my mysql database, and they will select out of 2 recurring payment plans that will take them to paypal so they can enter their card information (i do not want them to have to have a paypal account), then when it returns them to my sign I want to save that authorization id to that customer in mysql and the recurring payment plan that they chose. As you can see in the attached [login to view URL], I have already made the signup form and I will do all the mysql work. I just want help on the paypal recurring payments part. I want someone who has done it several times. I have a few c 1. Can the customer cancel the recurring payment themselves, or do I need to cancel it for them? 2. How do I know when it charges them, can I setup a webpage that paypal can send data to such as when a recurrring payment happens with the customers id so I can record its history into my software? 3. I also need the option for them to pay one time payment by credit card instead of making it recurring payment. I've set up the paypal api a couple times in the path but do not have time to do it this time. I will send you the php page that contains the html form for you to integrate it. Thanks