How To Access Custom App API From Theme App Extension in Shopify?

Solution:

You can't, you need to create a secure endpoint that will handle requests coming from a frontend (world) and then use JavaScript Fetch API to query that endpoint. That includes building custom auth for frontend requests and validation logic. So you should end up with creating a theme app block that will contain<script> tags with your fetch request in it.

By the way, /api/auth is usually used to handle OAuth 2.0 during app installation process, so you won't be able to do anything related to what you want to achieve with it.

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