Easyship provides webhook events to notify you proactively.
Easyship provides several webhook event to proactively notify you about your shipment's changes. After you setup your endpoint to receive specific event(s), you'll start to get the event payload whenever the event has happened.
For the content of the event payload, you can either check API reference or by Test button on Easyship dashboard's Webhook page.
This document can help you to set up your webhook settings step by step.