No guidance on setting up and using webhooks with shopify-app-template-php

Issue summary

I am attempting to set up Webhooks in a shopify app generated by the shopify-app-template-php. There is no clear documentation I can find about how to do this.

However, the template has already done a lot of this for us.
How am I supposed to register a Webhook for example orders/create without overriding the boilerplate that Shopify has provided in this template?

What is the correct way to process them after this? Where is the /api/webhooks endpoint that the boilerplate code sets being used? I can't find it in the template.

This is extremely unclear what the pattern should be for using Webhooks with this template without overriding the boilerplate code, and there are no docs I can find specifically to guide me.

Can anyone please help point me to the correct docs for how to set up and use Webhooks within this template?

Note:
I am developing a custom app that requires me to perform a certain task on when an event occurs in the store.

Start by locating the template's /api/webhooks endpoint and the existing webhook boilerplate. Document how to register an orders/create webhook, how requests are processed, and how custom app behavior fits without overriding the provided code. Done means a newcomer can follow the documented pattern to configure and handle a webhook.