从Paypal检索付款确认

I have a membership application form that collects basic demographic data. Once the form is submitted, I use PHP to insert the data into a database and then redirect the user to Paypal for membership payment. I would like to add a field to each user record that indicates whether or not a payment has been posted. Is there a way Paypal can pass back a confirmation that I can use to update each membership record?

Yes, check this out is called IPN is provided by paypal, this is how it works