Code Discount not applying in Cart but applying in Checkout

Extensions
1

I’m developing a Shopify app with an app embed/block that automatically applies discount codes based on certain conditions.

I’m doing this by sending a fetch to /discount/{code}.
This returns a redirect. I assume a discount is applied now.

But its not shown in the cart. If I fetch /cart.js the cart items does not have discount applications. When I open the checkout page I see the discount applied. The weird thing is once I open a checkout, I see that the original /cart.js is now updated to have the discount shown and theme shows discount as well

Simplified:

  • I apply discount using fetch("/discount/{code}")
  • When fetching /cart.js initially, the response doesn’t include discount applications
  • After visiting checkout and returning to cart, the same /cart.js endpoint now includes the discount information

Questions

  1. Why is the discount not immediately visible in the cart on my live theme?
  2. Is there a step I’m missing after the /discount/{code} fetch to ensure the cart UI updates?
2

Issue resolved!

In my case there was an app called Monk on this theme doing something with the cart. Disabling the app got it to work!