I have a website where users are able to have free or premium access to content. I would like to sell 30 day and 90 day premium account upgrade to my customers using paypal. User would click the buy button, pay on paypal site and the account would be updated on my site automatically with IPN. The question is: * Which paypal service would suite me best? * Do I need to generate order id every time user sees a buy now button so I have something to pass to paypal? or should I send user id and item id and create order when IPN connects and purchase is made? I would like to NOT reinvent the wheel...
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