For setting up inline app's notification, you will need to set it up by Backhouse and iPad, please check by following steps:
Backhouse:
Login Backhouse
Company Settings > Edit > Notification > choose one branch > enable Notification center settings button > Save
After that, you may set by your iPad with the below steps:
Settings > System Settings > Push notification options > enable the notification
After the above setting, you may check the notification in the little bell sign on the bottom of the left while the booking created, booking canceled