Returns true if valid credentials exist for the given data source and requesting user. Some data sources doesn't support service account, so we need to talk to them on behalf of the end user. This API just checks whether we have OAuth token for the particular user, which is a pre-requisite before user can create a transfer config.
The URL uses Google API HTTP annotation syntax.
The data source in the form:
Authorization requires one or more of the following Google IAM permissions on the specified resource
The request body must be empty.
If successful, the response body contains an instance of
Requires the following OAuth scope:
For more information, see the Auth Guide.