Using postman + oauth2 to access Google Apps Admin SDK - oauth-2.0

Question

I am struggling to get oauth2 working between postman and the Google Apps Admin Sdk. I have created a client app in the google console and set the Authorized redirect URIs to https://www.getpostman.com/oauth2/callback and my settings in postman are as follows
Auth URL - https://accounts.google.com/o/oauth2/v2/auth
Access Token URL - https://www.googleapis.com/oauth2/v4/token
Client Id - some id here
Client Secrent - some secret here
Scope - https://www.googleapis.com/auth/admin.directory.user.readonly
Token Name - Google
Grant Type - Authorization Code
Request Access Token Locally - Checked
This returns a token - xyz - after logging in.
I do a GET request with the token in the url
https://www.googleapis.com/admin/directory/v1/users?key=xyz
The error I am getting is below
{
"error": {
"errors": [
{
"domain": "global",
"reason": "required",
"message": "Login Required",
"locationType": "header",
"location": "Authorization"
}
],
"code": 401,
"message": "Login Required"
}
}
From what I have read this should work. Where else do I have to login? What am I doing wrong?

Answer 1

After playing around I figured out my url was incorrect. Changing key to access_token did the trick.
Just a side note, ensure you specify the domain or customer parameter otherwise you will receive a bad request error.