Paypal buy now/subscription response

Hi,

NOT related to CAKEPHP, sorry about that but I thought this question
(and also answers) will help this community.

I have built an information portal in PHP [Something like a recipe
book], where the first few recipes are free to access. The advanced
recipes are available only to paid members.

I intend to use a simple subscribe now paypal button. When the user
clicks on this button, he is directed to paypal website and upon
payment redirected back to my site.

How do I collect the payment information from paypal? I do not want to
use a wsdl.

I need the information to update my user level field [0 for registered
users, 1 for paid users] in the users table.

Any pointers? Does IPN do the trick for this? Is there a better
solution for this?

Thanks,

Bharadwaj

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