I think the method for account management to work is to create a ManagedCustomerLink to a client's adwords account with my MCC account. I as successful to create the link between accounts. The next steps after "Extending Invitations" in the "Managing Account" guide:
https://developers.google.com/adwords/api/docs/guides/accounts-overview#getting_started_with_test_accounts; are "Rescind invitations", "Get pending invitations" and "Accept/Decline invitations". I cannot just "Accept/Decline invitations" I sent from my MCC on behalf of my client; I will need to be authorized by my client. So I would like to know how do I call the AdWrods API to such that my client does not need to log into their AdWords account via AdWords console and accept the invitation manually; I am having trouble looking for ways to run the guide's "Decline invitation" code without getting a authorization error. I am just trying to manage my client's AdWord account to perform some basic operations for their campaign and I am using test accounts for now.
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