Hey folks, As checkout extensions now default to non-blocking behavior , I understand that cart/checkout validation functions are the way forward for validating checkouts. However, we’ve found two issues that prevent us from completing this migration. Context: Our validation function is scoped to t…

Hi @Patrick_Jakubik Thanks for flagging this - digging into this on my side now.

Hi again @Patrick_Jakubik It does appear that this is a bug on our side - it’s on our teams radar to address asap.

Hi @Patrick_Jakubik , Thank you for reporting. Re: issue 2, we are taking a look. Re: issue 1, Our validation function is scoped to the checkout completion step. Expected behavior: validation should run alongside Shopify’s built-in validations before the buyer reaches the review step, not afte…

Hi @avocadomayo , thank you for looking into this. Regarding Issue 1 - CHECKOUT_INTERACTION doesn’t work for our case because it triggers validation errors immediately when the checkout loads, before the buyer has had a chance to interact with anything. This is too aggressive. What we need is behav…

Hi @avocadomayo & @Liam-Shopify Just wanted to follow up on this - we’re starting to see more merchants affected by the issue lately, so I wanted to check in and see if there’s any update.

We’re seeing both of these as well, on localized fields rather than address fields — so it doesn’t seem field-specific. Same thing on the review step: the error comes back complete in the response, the order is correctly blocked, and the buyer sees nothing. And +1 on CHECKOUT_INTERACTION not being…

[Bug] Cart validation functions - two issues blocking migration from useBuyerJourneyIntercept()

Functions

Patrick_Jakubik March 9, 2026, 8:49am 4

Thanks Liam! Could you look also into this similar issue? [Bug] Cart validation functions - Apple Pay / Google Pay shows unhelpful validation error on product/cart page

Thank you!

Topic		Replies	Views
Cart/checkout validation runs too often Functions cart-validation	7	273	November 27, 2024
[Bug] Cart validation functions - Apple Pay / Google Pay shows unhelpful validation error on product/cart page Functions cart-validation	5	200	June 17, 2026
Cart and Checkout Validation error messages not displaying during Google Pay accelerated checkout Functions cart-validation	2	166	October 7, 2025
The Buyer Journey Intercept API is now deprecated Extensions checkout-ui-ext	16	587	August 14, 2026
useBuyerJourneyIntercept bypassed when using Apple Pay Extensions checkout-ui-ext	3	163	April 11, 2025

[Bug] Cart validation functions - two issues blocking migration from useBuyerJourneyIntercept()

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