Need suggestion regarding translate API

[Mayank Goyal]

Hi, I was reading documentation for translate API and have a question on the same.

For authentication of basic translate API, :- 

We either use API key or Service account. I know API key is straight forward, however please suggest with service account is there a way to authenticate without using client Library (like via a direct Rest API call and get token or something) or is it mandatory to use client library and pass Json file with service account details to it and also consume actual API via client library only.

If I have to use translate API with service account authentication with Postman, how will we use it?

[rmir]

If you do not want to use a client library, you should be able to authenticate the REST calls [1] by using the environment variable `GOOGLE_APPLICATION_CREDENTIALS` [2]. 

I am not familiar with Postman requirements, so let us know if the above solution would work for you or if you need a different approach to authenticate. 

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[1] https://cloud.google.com/translate/docs/basic/quickstart#translate_text_example 

[2] https://cloud.google.com/docs/authentication/production#passing_variable