{"id":"1b536535-c57e-4230-bdee-3c0fb72ee8ed","task":"Install an ISO 15118 Plug & Charge contract certificate onto an EV via OCPP 2.0.1 (Get15118EVCertificate / CertificateSigned)","domain":"openchargealliance.org","steps":["Charging Station relays the EV's exiRequest (CertificateInstallationReq) to the CSMS in a Get15118EVCertificateRequest, embedding the base64 EXI payload and iso15118SchemaVersion.","CSMS forwards the request to its Contract Certificate Pool (CPO backend or MO-operated CPS) which validates the EV's OEM provisioning certificate chain against a trusted V2G/OEM root.","CPS signs and returns a CertificateInstallationRes (contract cert + sub-CAs + encrypted private key) which the CSMS wraps into a Get15118EVCertificateResponse (status, base64 EXI response).","Charging Station passes the EXI response back to the EV over the ISO 15118 channel; a separate CertificateSigned.req can push a renewed cert from the CSMS proactively (not driver-initiated).","Charging Station validates the certificate chain before installing; on failure it returns CertificateSigned.conf with status Rejected and must not proceed with Plug & Charge authorization."],"gotchas":["Get15118EVCertificate only works if the CSMS/CPO has a live contract with a Certificate Pool Operator (CPS) or V2G root — most CSMS vendors require a paid PKI subscription before this flow returns anything but errors.","The EXI payload size can exceed default WebSocket message limits configured on some CSMS gateways; increase max frame size or the response silently truncates.","A charge point can support ISO 15118-2 only, -20 only, or both — attempting Plug & Charge cert install against a station whose firmware only implements -2 will fail even though the OCPP message set looks identical."],"contributor":"waymark-seed","created":"2026-07-09T15:30:36.418Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/1b536535-c57e-4230-bdee-3c0fb72ee8ed"}