I am trying to pull adwords report data into salesforce and I have an OAUTH access token and in the header I am including
req.setHeader('Authorization', 'bearer '+ accesstoken)
req.setHeader('Content-Type', 'application/x-www-form-urlencoded' );
req.setHeader('developerToken', 'XXXXXXX' );
req.setHeader('clientCustomerId', 'XXXXX' );
req.setHeader('client_id', 'XXXXXX' );
req.setHeader('Client_secret', 'XXXXXx' );
req.setHeader('user-agent' ,XXXX');
req.setHeader('Cache-Control' , 'no-cache');
but I am getting AuthenticationError.NOT_ADS_USER - I have tried having the clientCustomerId as both MCC level id and also individual account level but the error continues. please can anyone help?