You can have your event, flight, hotel and restaurant reservations, orders and parcel deliveries, and prompt for reviews or custom actions in Google Now by addi

You can have your event, flight, hotel and restaurant reservations, orders and parcel deliveries, and prompt for reviews or custom actions in Google Now by adding meta-data to your notification emails: https://developers.google.com/gmail/actions/google-now https://developers.google.com/gmail/actions/google-now From the other direction, you can have Google Now call back into your Android app, triggered by hot words, as demonstrated in the new version of Todoist: https://todoist.com/blog/2013/11/todoist-for-android-adds-support-for-google-now-and-dashclock/ https://todoist.com/blog/2013/11/todoist-for-android-adds-su... I can't find any published API for the latter.