You can post a notification banner for all users in a market to see when they log into Business App.
You can use this to announce a promotion, share an important link or video, or give a status update that might be important for all your clients.
How to publish a banner
1) Navigate to Partner Center
2) Click on Administration > Customize
3) Under "Business App Settings", find Notifications tab, then "Global Notification Banner".
4) Add your message and an expiry date. This message will appear for users until they dismiss it or it expires.