Add webhooks

[sebastianpisula]

At this point, merchants can manage functions from the application level as well as from the Shopify settings - they can remove / add / activate / deactivate functions.

I suggest creating additional webhooks where you can track changes in applications.

• delivery_customization/create
• delivery_customization/delete
• delivery_customization/activate
• delivery_customization/deactivate
• delivery_customization/update.

The Discounts team recently added similar webhooks for similar reasons.