Registrar API docs

The Masters team has recreated a Registrar IDA that includes a Registrar API that lets partners who offer edX Masters communicate with edX services to fetch program and course metadata, and to read and write enrollment data for learners in Masters programs.

We need to document the Registrar API. At some point, we might also want to create developer docs so that Open edX users can install and use the Registrar API.

Sources:

• Confluence Registrar IDA

• API generated with OpenAPI fka Swagger

• YAML spec for the API

• Partner Integration Guide (Google Doc)

• Registrar Service - Mock API