Creating a customer-facing webpage that uses Admin API

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I want to create a webpage that the customer can access to modify their order using the Admin API.

It seems all the Shopify App tutorials are meant to be embedded in the merchant's dashboard, but I also want a part of my App to be customer-facing.

Is this a valid use-case for creating a Shopify App?

I'm pretty new to web development so I'm not sure all the inner-workings of how the tutorial Apps work and whether I can extend them to create a customer-facing webpage.