What is in a CDR?

Who wrote it, the token that started it, the one EVSE used, the tariff as it applied, the session as periods with energy and time, and the totals before taxes. The deep dive reads a complete record line by line.

Explained in

OCPI and roaming · Deep diveOne CDR, field by fieldThe charge detail record of the 3:41 PM session as the Austrian operator sent it to the German provider: every field of the OCPI 2.3.0 record, read line by line, and the credit record that would cancel it.

Nothing in the record is typed by hand. Each block has one source:

From “Where each block comes from”, stop 09

Terms

  1. TokenIn OCPI, what a driver starts a session with, such as a charging card, a key fob or an app account; it carries the contract ID of the driver's provider.
  1. What does OCPI exchange?Locations and tariffs from the operator, tokens from the provider before a session; sessions and commands during it; the CDR after it.
  2. What is a roaming hub?A platform that connects many operators and providers through one link each. Many companies use hubs for the long tail and direct OCPI links for large partners.
  3. How is a roaming card authorised?Either from a cached list the provider shared with the operator, or by a real-time check with the provider. The provider sets which, per token.
  4. Can a CDR be changed after it was sent?Not directly. OCPI treats CDRs like invoices: a wrong CDR is cancelled with a credit CDR and replaced by a corrected one.