The Genesys Callback Push Notifications iOS Sample Code demonstrates how to send asynchronous messages (push notifications). While iOS uses APN (Apple Push Notifications) and Comet, Android employs GCM/C2DM and Comet.
ProgrammableWeb first covered Ordr.in a little over a year ago as it released APIs during Hackfood the Hackathon. Since then, Ordr.in has made significant strides in its relationships with developers and partners. Two relationships Ordr.in announces this week include partnerships with Microsoft and Delivery.com.