App logic works in backend (admin) but not frontend in Dev Store

Ask & Offer
1

Hi everyone,

I’m building a Shopify app that applies bundle discounts and logic.

Current behavior:

  • App backend (Admin panel) works fine

  • Rules are saved correctly

  • API routes are responding in admin

Problem:

  • On the storefront, app logic is not working

  • API calls return 404 or don’t trigger

  • Same logic works from admin but not from theme/frontend

Details:

  • Using app proxy / API routes

  • Dev store

  • App URL changes on every shopify app dev run

  • Frontend fetch calls fail but admin fetch works

Question:

  • What is the correct way to expose app APIs to storefront?

  • Is App Proxy mandatory for frontend access?

  • How to handle changing app URLs in development?