I'm trying to understand where commerce stores it's rules hooks. In my Drupal 7 install I have a tonne of custom entities which I am working on plugging into ctools to enable panels to alter the add/edit forms. My next step is to hook these custom entities to allow rules to drive various processes into them. I notice within rules when commerce is installed there is a bunch of predefined rules I expect this will be a good starting point for me.

Welcome any advice.