This REST API allows a HTTP client to create, read, update, and delete WordPress Download Manager data using requests in JSON format. WordPress Download Manager REST API uses standard HTTP verbs which are understood by most HTTP clients. This API is built on top of WordPress REST API and lives at /wpdm/v1 namespace.
You will find the complete documentation of this REST API here https://imsas.github.io/wpdm-rest-api-docs/#introduction