← All breaking-change reports

Shopify breaking change: Customer Account API Customer.lastIncompleteCheckout and Checkout types removed in 2026-10

shopify · breaking · 2026-07-06 · upstream source

What changed

From the upstream announcement:

As of Customer Account API version 2026-10, the deprecated Customer.lastIncompleteCheckout field is removed. This also removes the now-unreachable Customer Account API Checkout type subtree, including: Checkout Checkout.appliedGiftCards AppliedGiftCard AvailableShippingRates CheckoutLineItem CheckoutLineItemConnection CheckoutLineItemEdge ShippingRate The Customer.lastIncompleteCheckout field was previously deprecated and returned null . This change removes stale Checkout Classic schema from the Customer Account API. Action required If your app queries Customer.lastIncompleteCheckout or any nested fields on the returned Checkout object, update your queries before upgrading to API version 2026-10. Remove selections such as: customer { lastIncompleteCheckout { id appliedGiftCards { id } } } There is no replacement field in the Customer Account API. If you need active cart or checkout state […]

Who is affected

Codebases that call the Shopify API surface named above.

To find out whether your repo is hit — file and line number, no code leaving your machine:

npx mendapi scan --repo .

How to fix it

mendapi ships a deterministic migration pack for this change (shopify-customer-last-incomplete-checkout). Preview the patch locally (dry-run is the default; nothing is modified without --apply):

npx mendapi fix --repo . --migration shopify-customer-last-incomplete-checkout

The pack is idempotent, gold-regression tested, and safe on partially migrated code.

Detected and tracked by mendapi — Dependabot for every API you depend on. Scans run locally; your code never leaves your machine.

Related

Pre-release. Change data is recorded from upstream provider releases, changelogs and OpenAPI spec diffs; every article links its source.