The installation of signed contract data can be done via the charging station. After a successful handshake between EV and the charging device, the EV sends a certificateInstallationRequest to the charging device, which will be forwarded via the CPO backend (OCPP 1.6with PnC Message: Get15118EVCertificate) to the CCP. The CCP finds the contract of this EV and delivers it back to the CPO backend.