What is returned from addition of email addresses using Customer Match?

Hello,

I'm trying to setup custom match via email through the adwords API.  From my understanding the process would be like this:

1) Upload list of email addresses to the AdWord API

2) AdWords campaigns gets updated using Customer Match audience 

3) ...
4) Profit

My question is what data from these users is gained using customer match? Will I get anymore info about the user (unique ID, etc.) or will it just be an additional email in my audience?

Thanks for your help!

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