Shopify Apps - Connect the frontend to the backend and test the app

Part of my Shopify Learning Series

Connect the frontend to the backend and test the app
Key features :
- How to connect your FE/BE
- Shopify access scope features
- Test your app

Notes: https://docs.google.com/document/d/1CXQa1YUN1lNyVTawdlA_BwxQD_impPLpmBjZTJz9owo/edit?usp=sharing