Postman collection was created which can be used to explore API, use cases and has possibility to configure it to use with client environment or with mocked environment:
In the archive there is a collection itself and example mock environment. Both need to be imported into postman.
The collection consists of 2 folders:
API spec - just a plain listing of all available calls, those are not mocked.
UseCase - the folder contains typical API use cases, all of those are mocked and contain complete examples with requests and responses.