Open Charge Point Interface (OCPI): what is it and how does it work?

Drivers of petrol-fueled cars generally don’t stop to check which fuel company operates the petrol station they plan to fill up with. Imagine how cumbersome it would be if they had to use one specific fuel provider (Shell, BP, Esso, etc) only? The same type of seamless autonomy that exists within fuel providers is the goal of the Open Charge Point Interface (OCPI) protocol for electric vehicle cha