Configuring request to Google My Business API to avoid Unauthenticated error - node.js

Question

I keep getting an unauthenticated error back when submitting my request to the Google My Business API in my Node.js app. The response:
{
"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.",
"status": "UNAUTHENTICATED"
}
}
For what it's worth, I'm using the request-promise client to make the request. My function is below. I just received the access token, so I'm fairly certain that it's good, and I can see it through the err.options.Authorization log. I know the location ID doesn't exist yet, but I don't think that's what the error is telling me.
const request = require('request-promise');
...
function checkLocation (loc) {
return request({
method: 'GET',
uri: `https://mybusiness.googleapis.com/v4/accounts/${ACCOUNT_ID}/locations/${loc._id}`,
Authorization: `OAuth ${ACCESS_TOKEN}`
})
.then(function (response) {
console.log(response);
})
.catch(function (err) {
console.error(err.error, err.options.Authorization);
});
}
Is my request formatted incorrectly or am I not sending all I need to be?
Update: I left out possibly crucial information that this is through the one time authorization process for server-side apps like outlined here: https://developers.google.com/identity/protocols/OAuth2. My trouble is wrapped up in the sentence on that page, "After an application obtains an access token, it sends the token to a Google API in an HTTP authorization header."

Answer 1

Turned out my header wasn't formatted correctly. The Authorization key should be in a headers object:
{
method: 'GET',
uri: `https://mybusiness.googleapis.com/v4/accounts/${ACCOUNT_ID}/locations/${loc._id}`,
headers: {
Authorization: `OAuth ${ACCESS_TOKEN}`
}
}