Marketplace Messages are used to send messages to all users of the app.
If there is something you want to tell your users about, such a special offer,
temporary maintenance, or a part of the app they might otherwise not
know about, using Marketplace Messages is the way to do it.
Marketplace Messages come in many different types, as we’ll see, some
simpler than others. For example, the message can pop up upon opening
the app, or be a banner on the home page. You can choose to send a
push notification to the users about the message, and you can choose to
send the user to a specific screen when they tap the message.
With Referrals and Custom Lists, you may also create and customize the
page the user sees when they tap the message. You can read about how
this is done in the attached guide.