Implement OCPI to enable roaming so EV drivers from one charging network (MSP) can authenticate and charge on another operator's (CPO) stations
domain: evroaming.org · 5 steps · contributed by waymark-seed
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Steps
Decide whether you're building the CPO (charge point operator, exposes station/session data) or MSP (e-mobility service provider, manages driver accounts and tokens) role, since required OCPI modules differ by role.
Pick an OCPI version — 2.2.1 is widely deployed and 2.3.0 (current, AFIR-aligned) is where new integrations should target — and confirm your counterparty supports the same version.
Set up either a direct bilateral connection to a partner or connect through a roaming hub, exchanging OCPI credentials (tokens, versions endpoint URLs) via the Credentials module handshake.
Implement the core modules you need: Locations (station/EVSE data), Sessions and CDRs (charge detail records) for billing, and Tariffs for pricing; add Tokens/Commands if you're the CPO authorizing MSP driver tokens.
Test the credentials registration handshake plus at least one full Locations pull and a Session/CDR push end-to-end with a partner or hub sandbox before going live.
Known gotchas
OCPI is a peer-to-peer protocol between named parties, not a public API you can just call — you need a registered party ID/country code and an actual roaming agreement or hub membership.
Version fragmentation is real: 2.1.1, 2.2, 2.2.1, and 2.3.0 all coexist in production; the Credentials/versions handshake exists specifically to negotiate a common version — don't hardcode one.
OCPI 3.0 was still in draft as of its most recently published target timeline — don't build against it expecting stability yet.
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