...
You’ll notice that auto_order_update will fire in conjunction with other operations. This webhook is fired whenever the database record is updated. If you’re storing a copy of the auto order record off in your own database then listening to the auto_order_update operation is a good idea.
Related Documentation
https://www.ultracart.com/api/#resource_auto_order.html
Questions
If you have further questions about auto order webhooks and implementing your custom business logic using them, please contact support@ultracart.com and we will be glad to expand upon this documentation.