Ive been trying to implement a google contacts / CardDav sync for days now.

OAuth2 info is only provided for the service account from the api console, and 
u cant add contacts to that account. Delegating a domain-wide service account 
also doesnt work when trying to impersonate the Admin, i get access denied even 
though i followed all the instructions in the docs for domain-wide delegation

Only way ive seen it work is through the curl command in unix. But that 
requires user clicking (login) to aprove the app's access to his Contacts (or 
other scope)

Let me know if u get this working

Good Luck

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