'Google Clouse Translate API calls return 400 Bad Request

I'm attempting to use the Google Cloud Translate API v3 to perform some translations in Postman.

I've configured my Google app to user an OAuth 2.0 Client ID. I can successfully get an access token using OAuth. But every time I make a request, the response is a 400 Bad Request.

Here are my OAuth 2.0 settings in Postman:

Postman OAuth 2.0 Settings

Here are the configured request headers:

Postman Request Headers

And, here is the request body:

Postman Request Body

Any ideas on why I get a 400 response with this request?



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