Source-code, documentation and test-data are bundled in one archive.
The archive can be downloaded here: 3. Downloads
How to view the API documentation
The API documented using the OpenAPI Specification, an API description format for REST APIs, see → https://www.openapis.org/ for general information on REST API documentation.
Go to → http://editor.swagger.io/, copy the content of the openapi.yaml file located at pep-crypto-documentation/35-schema and paste it in the editor.