One webhook per item

There's a limit of one webhook per item (file or folder) per application per authenticated user.

Once a webhook is attached to an item, no second webhook can be attached even if the second webhook would respond to a different trigger event.

For example, let's assume a webhook is set up by John Doe to watch FILE.UPLOADED events in a folder with the name Junk for an application named CleanupApp. At that point, no second webhook can be added to the Junk folder by the CleanupApp by John Doe, even if it is to trigger for a FILE.DOWNLOADED event.

To listen to another event, update the existing webhook or create a new application.

1000 webhooks per application, per user

There is a limit of 1000 webhooks per application, per user.

To create more webhooks for a user, create another application or update existing webhooks to apply to higher levels in the folder tree.

Notification URL restrictions

The notification URL, or address for a webhook must be a valid HTTPS URL that resolves to a valid IP address. In addition, it should have a certificate signed by a reputable certificate authority, as Box does not support self-signed SSL certificates.

The IP address of the server must be publicly accessible from the internet and cannot be a (*.) address. The port used in the URL must be the standard HTTPS port (443). Notifications will not be delivered to other ports.

No webhooks on root folder

V2 webhooks cannot be created on the root folder, which is the folder with ID 0. Instead, you will need to leverage a v1 webhook.

When the permissions on an item prevent an action from occurring, no notification is sent for the attempted action.

Reasons for webhook deletion

The following reasons can cause webhooks to be deleted.

  1. Deleting a Box application automatically deletes all webhooks associated with the application.
  2. Deleting all active Access Tokens associated with a webhook will automatically delete the webhook. This includes Developer Tokens and password
  3. If the last successful delivery was 30 days ago and the period between the last successful delivery date and the last trigger date was more than 14 days, the webhook will be automatically deleted.

In all of these cases Box would send a webhook payload with the WEBHOOK.DELETED event name to the notification URL. The body of the payload will include the following additional information.

"additional_info": {
  "reason": "auto_cleanup"