Cart updates that result in no changes to the cart no longer trigger carts/update webhooks
Shopify developer change
MerchantDiff detected this entry in Shopify's official developer changelog on October 12, 2026.
This Shopify update is categorized as API, Update, Ajax API, Storefront API.
What changed
Cart operations that leave the cart unchanged, for example, resubmitting the same values a cart already has, no longer trigger a carts/update webhook. Shopify sends a webhook every time a cart's contents or properties change. Previously, every cart operation produced a carts/update webhook. This change removes the duplicate notifications, and apps receive one carts/update for each change to a cart instead of one per request.
Who is affected
Apps that subscribe to or process Shopify webhooks or event payloads should review this change.
What action may be needed
Review the official Shopify entry, confirm whether the change touches your app, and test the affected workflow before your next relevant deployment.
Use the official Shopify entry below as the source of truth for technical implementation details, affected APIs, migration instructions and deadlines.
Want the actionable version?
MerchantDiff monitors Shopify API changes, deprecations, deadlines and ecosystem updates, then turns them into developer-focused release intelligence: what changed, who is affected and what action may be needed.
Get MerchantDiff →