Notification bundling

Notifly bundles notifications for you so that users don't receive multiple notifications for the same notification (unless you want them to 😉). We do this by creating a bundle key which is a concatenation of the notification key set for a notification, the link (if any) provided when the notification was sent via the API and the bundle segment (if any) also provided when the notification was sent via the API. This key is then used to group notifications both in-app and in emails.