I get UNAUTHENTICATED error when I call Method: purchases.subscriptions.get endpoint

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When I try to call https://androidpublisher.googleapis.com/androidpublisher/v3/applications/{packageName}/purchases/subscriptions/{subscriptionId}/tokens/{token} from my backend server to verify a purchase I receive :

{
  "error": {
    "code": 401,
    "message": "Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.",
    "errors": [
      {
        "message": "Login Required.",
        "domain": "global",
        "reason": "required",
        "location": "Authorization",
        "locationType": "header"
      }
    ],
    "status": "UNAUTHENTICATED"
  }
}

How can I authenticate from my backend server (so without any user interface)? Is there any way to create an API key somewhere and use it to authenticate?

google-play-services google-play google-api in-app-purchase android
1 Answers

The error message

Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.

States that authorization is required.

If you check the documentation for Method: purchases.subscriptions.get

You will notices that it states that this method requires authorization with the following scope

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Assuming this is an account you the developer control and you only want to access this single account you should look into using a service account for authorization. Documentation here Using a service account

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