Hello,
I am creating one automation application using AdWords API with PHP(Client Library). This application is about to manage the account of others.
For that,
1). I have created one manager account(GA1). I am using a developer token of the same account.
2). I have created one test account of Google AdWords(GA2). I am using the customer id of the same account.
3). I have created one Google Developer Console account(GA3). I am using clientId and clientSecret from project using this account and generating the refresh token using the same.
But when I hit my API to find campaigns, I am getting an unauthorized error. Am I missing anything here? Or am I doing something wrong? I am attaching my error screenshot along with this.
GA: Google Account. I am using 3 different Google Accounts.

Any help will be appreciated. Let me know if you need more info.
Thanx,
Yuvraj Chauhan.