Open Zaak adheres to the API-specifications as described by the VNG standards for "API's voor Zaakgericht werken". The interaction between these API's can be found there as well.
The following API's are available in Open Zaak:
| API | Specification version(s) |
|---|---|
| Zaken API | 1.0 |
| Documenten API | 1.0 |
| Catalogi API | 1.0 |
| Besluiten API | 1.0 |
| Autorisaties API | 1.0 |
In addition, Open Zaak requires access to a Notificaties API. Open Zaak uses Open Notificaties by default.