[SOLVED] How to create a special trigger on appwrite

How do I create a callback url or webhook url that will be triggered by an external service while I give it permission to do so.

In the attached image, a callback url and webhook url is required.

TL;DR

The user is asking how to create a special trigger on Appwrite. They were provided with a solution: creating an Appwrite Function using the auto generated domain. The user then asks how to create a callback URL or webhook URL that will be triggered by an external service. No solution is provided for this specific question.