How to identify a customer in AdWords

How can we identify a customer (person who viewed the ad) within AdWords Data, Can gclId help, are there any other identifiers and attributes that would tell more about the customer, like email or user Id. Please give me your direction. Thanks, Sree Sent from my iPhone -- --

Re: How to get developer token

After Creating the Manager account, how do we get the developer token??? I don't see any documentation on this. the MCC seems to be more UI based management, but we are trying to access the adwords report through the API interface. The API interface is asking for Client ID, Secret key, Refresh