This document is meant to be an introduction to Paypal integration in web2py, it does, by no means, cover all the possible integrations with Paypal, and is mostly centered on what Paypal names \emph{Standard Integration}. The examples given are proven at the time of writing this article, but they should be taken only as a lead and starting point rather than reference. For that, please use both paypal's and web2py's documentation.