Whenever I try to apply a discount code via the Storefront API, it says the code is not applicable, and it removes all cartLines. Interestingly if I then go and add a product to that very same cartId, the discount code is applied. If I take that very same discount code, and apply it manually in Sho…

Hi Magnus, From digging into this, it does seem that this is a bug with the cartDiscountCodesUpdate mutation which our team are already aware of and are addressing. I will update here when it’s resolved.

Hello, I was searching on this forum for a similar bug I have on my side: Every time I create a cart through GraphQL cartCreate and provide a free shipping discount code (manually created or created by an app), the checkout page opens, applies the code for 1 second, and then removes it. As for Mag…

Hi @Liam-Shopify Do you happen to have any ETA on this?

Hi - unfortunately I don’t have an ETA on when a fix will be available, but the team are actively working on this.

Just poking to see if there are any updates to this?

Hi I am facing the same issue, Is there a workaround for it?

cartDiscountCodesUpdate removes all cartLines, and does not apply codes

Hydrogen and Storefront APIs

damien March 14, 2025, 8:17am 4

edit: problem solved in our case. cf The free shipping discount code, added to a cart through cartCreate, is automatically deleted when opening the checkout URL

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The free shipping discount code, added to a cart through cartCreate, is automatically deleted when opening the checkout URL Hydrogen and Storefront APIs storefront-api	4	101	March 18, 2025
cartDiscountCodesUpdate Mutation: 'discountCodes' Argument Not Accepted in 2025-01 API Version Hydrogen and Storefront APIs storefront-api	1	68	October 31, 2025
The `cartDiscountCodeUpdate` mutation now requires the `discountCodes` field Changelog	3	94	October 31, 2025
Mutation cartDiscountCodesUpdate response randomly incomplete Hydrogen and Storefront APIs storefront-api	3	83	November 25, 2025
Code Discount not applying in Cart but applying in Checkout Extensions checkout-ui-ext	1	268	March 13, 2025

cartDiscountCodesUpdate removes all cartLines, and does not apply codes

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