3 Basics on notification mechanism
Each time an event occurs, data on this event is sent to a webhook endpoint.
To save resources on both sides, notifications are not sent immediately when the event occurs. Event data are collected and sent after a certain period of time. A notification contains event data of one event type.
The webhook endpoint must acknowledge received notifications correctly, otherwise event data will be resent after a certain period of time. Event data will be discarded after 10 unsuccessful notification attempts.