Any request to a GBDX API must include a valid token (also called Bearer Token).
To learn how to get a token, see Get a Token
If you're using Postman to make the API call, you can either add the Token to your environment variables, or select Headers and replace
When adding your token in Postman, be sure to remove the double parenthesis and their contents, then add the token. If you have added your token as an environment variable, you don't need to do this step.