Amadeus is a travel technology company dedicated to integrate travel ecosystem technologies. The Amadeus Asynchronous Scala SDK allows for callback functions, and adds the Travel Innovation sandbox to existing applications in order to create and test new prototypes. All GET calls require an API Key query parameter in the URL.
In January, OnStar announced an API would allow third party developers to integrate their applications with OnStar's platform. Last week, General Motors announced its first partner for API integration: RelayRides. RelayRides is "[t]he world's largest peer to peer carsharing marketplace." The partnership with GM allows OnStar users to leave their keys in their cars when renting a car to a fellow RelayRider. The renter can then unlock the car with a smartphone app or by responding to a text message.