A builder providing access to all free methods, which are not associated with a particular resource.
It is not used directly, but through the CloudSecurityToken hub.
Exchanges a credential for a Google OAuth 2.0 access token. The token asserts an external identity within an identity pool, or it applies a Credential Access Boundary to a Google access token. Note that workforce pools do not support Credential Access Boundaries. When you call this method, do not send the Authorization HTTP header in the request. This method does not require the Authorization header, and using the header can cause the request to fail.