How do I customize the Product Collection page, Cart Checkout page?

Shopify Apps
,
1

How do I customize the Product Collection page, Cart Checkout page ?

Would like to add custom UI element on the Product collection / cart checkout pages and call an external REST API and show the data on the UI element.

2

Where are you getting stuck? What’s blocking you from adding something to the cart or product pages?

3

Hi Jason,

Create a Custom App and Theme App Extension(App Block)

Configured the App Proxy to the Custom App.
Added a custom UI element on App Block and making calls to the Custom APP APIs

However, when I call the API from Theme app extension, it sends the shopify store password page html as response.