The ISO-15118 standard is focused on the communication between vehicle and charging station. It is based on certificates and requires a clear policy.
This communication is supposed to take place in a given context: first, the charging station must be connected to a CPO back-end system (BOP) and be authenticated by certificates.
Vehicles must also be authenticated by certificates. Those vehicle certificates are delivered by Car-Makers and must be accessible and trusted by Mobility-Operators.
For “plug & charge” features, the user must have a valid subscription to an eMSP offer, and this subscription has to be described in a certificate. These contract certificates are delivered by e-Mobility Operators (eMSP) and must be accessible and trusted by Charging-Points-Operators and by Car-Makers.
The certificates must circulate between actors. This circulation process is usually called “pool mechanism”.