The OCPI interface, Open Charge Point Interface (OCPI), is the interface between charging stations for electric vehicles
charging andthe transmission of Charge Detail Records (CDR) with billing-relevant information
. Thanks to the OCPI interface, compatibility is established that enables drivers of electric vehicles to inform themselves about the costs of the charging process everywhere and to bill automatically, which leads to an improved market penetration of the charging infrastructure. The OCPI protocol is based on HTTP and uses the JSON format.