Limitations

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 (*.)box.com 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.