The Appboy Ruby SDK by Dynamo communicates with the API to implement marketing automation features into mobile applications. Resources include installation and examples that demonstrate initialization. Additional code shows how to track user attributes, track events, and track purchases.
Changes to an API Terms of Service (TOS) are an inevitable part of API operations, and as API owners work to evolve their APIs, changes can often be at odds with the community. As some API seem to struggle with the best way to update, Google's approach appears to be more balanced. Google just updated its TOS for Google Earth and its popular Google Maps API.