How to get access to purchasing info in a module

[francesca]

I would like to bind a function that on every 'product-purchased' or 'order-sent' event  access to some client informations and order id. Just that. And since is my first plugin I'm finding it quite difficult and I don't where to insert myself in order to retrieve that data.

I looked for some hooks I could use, and I found paymentReturn, which is called when the user is sent back to the store after having paid on the 3rd-party website, or paymentConfirm, called when an order's status becomes "Payment accepted" (I don't know what kind of information I have access the moment these hooks are being called, so I don't know which one to choose): is this correct? There is a better way to do it?

Edited November 7, 2017 by francesca (see edit history)