We are using the MPNowPlayingInfoCenter API to provide information to the “Now Playing” system UI. This works as expected, except that when the app is manually terminated, the information is removed from the UI. Our question is: Some apps (for example, Audible) are able to appear in the “Recently Played” section of the UI. This section seems to show a history of apps that previously provided “Now Playing” information but are not currently playing anything. We would like to know which API is used to achieve this behavior.
Now Playing / Recently Played API
There's a series of system integrations that media apps should pursue, and they are detailed in Improving Siri Media Interactions and App Selection. Pay attention to the media intents, and also interactions that you donate to the system to help inform the system of the user's activity in your app.
— Ed Ford, DTS Engineer