Any call we make against a Google API is charged against a project quota. Depending on the API that we’re using, that project quota might limit the frequency of calls, the total number of calls, or even the number of calls per user. But which project’s quota is it that’s being charged? To find out, we need to distinguish between two classes of APIs: Resource-oriented APIs are APIs that operate on resources that belong to a Google Cloud project. Examples for such APIs include the Compute...