Get the current Email address after Adwords Account link to my program

Hi Guys,

Just like to check if you can point me on how to get the current Email address of Client account that was linked to program

I'm coding a simple PHP program to connect to Multiple Adwords Accounts for Client, The system successfully got the required Access token, and Refresh token for I can consume the google services, But I would like to know if  how to get Client Info (specifically the Email address) without doing another OAuth?

Currently I only able to get the "customerId" from "CustomerService" class of AdWords API PHP

Any thoughts how to do this?

Thank you in advance

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