A collection which can be imported into Postman for testing the API is provided here.

before portal release 3.29 

from portal release 3.29

Importing Swagger to Postman

To import the Swagger to Postman, you can access the .json definition using the swagger UI.

Copy the definition, and save to a file. 

Change the following at the top:

"swagger" : "2.0",
  "info" : {
    "version" : "1.0"
  },

Change to:

"openapi" : "3.0.1",
  "info" : {
    "title"   : "rest api docs",
    "version" : "v1"
  },

Now you shold be able to import to postman.