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Cart mutations reject unconfirmed writes in POS UI extensions 2026-10

doc:019fb619-9b4a-74ac-a83e-3ffa98844fb4::feed/https://shopify.dev/changelog/cart-mutations-reject-unconfirmed-writes-in-pos-ui-extensions-2026-10
Product
Shopify Admin GraphQL API
Source
Feed
Change kind
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Deterministic evidence

Before / after

Extracted from Shopify's published contract. Open the source ↗

−1+81 change

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{
"content_hash": "141990997dba091926888ef65e2aa8296e2ec23597e5e0c676da8e19d99818a5",
"excerpt": "In POS UI extensions API version 2026-10, Cart API mutations reject when Shopify POS doesn't confirm that the cart changed. In earlier versions these mutations resolve whether or not POS applied the write. This is a breaking change for apps that adopt 2026-10, and those apps need to handle a rejected promise on every cart mutation they call. Apps on 2026-07 and earlier are unaffected. What changed POS reports the outcome of every cart write. Only a success result confirms that the cart changed.…",
"identity": "https://shopify.dev/changelog/cart-mutations-reject-unconfirmed-writes-in-pos-ui-extensions-2026-10",
"link": "https://shopify.dev/changelog/cart-mutations-reject-unconfirmed-writes-in-pos-ui-extensions-2026-10",
"published_at": "2026-10-07T16:00:00Z",
"title": "Cart mutations reject unconfirmed writes in POS UI extensions 2026-10"
}

Interpreted documentation change

What the vendor announced

The evidence describes a breaking change in Shopify POS UI extensions with API version 2026-10: cart mutations now reject when the POS does not confirm a change, whereas earlier versions resolved irrespective of POS apply, requiring apps to handle rejected promises for cart mutations. This is an informational change documenting behavior in the 2026-10 release and notes older versions are unaffected.

Cart mutations reject unconfirmed writes in POS UI extensions 2026-10 In POS UI extensions API version 2026-10, Cart API mutations reject when Shopify POS doesn't confirm that the cart changed. In earlier versions these mutations resolve whether or not POS applied the write. This is a breaking change for apps that adopt 2026-10, and those apps need to handle a rejected promise on every cart mutation they call. Apps on 2026-07 and earlier are unaffected. What changed POS reports the outcome of every cart write. Only a success result confirms that the cart changed.…

Vendor source ↗

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Multi-source correlation

Other Shopify findings correlated with this change across sources.

  1. Info
    SDK release 15.0.1sdk:npm/@shopify/shopify-api@15.0.1
    Shopify Admin GraphQL API
  2. Deprecation
    SDK version 13.0.0 yankedsdk:npm/@shopify/shopify-api@13.0.0
    Shopify Admin GraphQL API
  3. Info
    SDK release 15.0.1sdk:npm/@shopify/shopify-api@15.0.1
    Shopify Admin GraphQL API