I was wondering if you had a system for third-party vendors who want access to the Google Analytics API to onboard clients? Is there a client-data release form or do they need to provide us an API key or is it another solution entirely ?
Onboarding of clients would be done with the Provisioning API, which is not publicly available (and I have no experience with):
If all you want to do is to access your client's Google Analytics data via the API, that would be done through Oauth authentication:
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