--- title: Customer Account API Customer.lastIncompleteCheckout and... description: Shopify's Customer Account API version 2026-10 removes the deprecated `Customer.lastIncompleteCheckout` field and the entire `Checkout` type subtree. The field... canonical: https://daily.dev/posts/customer-account-api-customer-lastincompletecheckout-and-checkout-types-removed-in-2026-10-fhlqecth3 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Customer Account API Customer.lastIncompleteCheckout and Checkout types removed in 2026-10 | daily.dev og:description: Shopify's Customer Account API version 2026-10 removes the deprecated `Customer.lastIncompleteCheckout` field and the entire `Checkout` type subtree. The field... og:url: https://daily.dev/posts/customer-account-api-customer-lastincompletecheckout-and-checkout-types-removed-in-2026-10-fhlqecth3 og:image: https://api.daily.dev/og/posts/FhlqECTh3.png og:image:alt: Customer Account API Customer.lastIncompleteCheckout and Checkout types removed in 2026-10 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Customer Account API Customer.lastIncompleteCheckout and Checkout types removed in 2026-10 **[Shopify Developer changelog](https://daily.dev/sources/shopifychangelog)** · 1 min read · 0 upvotes · 0 comments ## Summary Shopify's Customer Account API version 2026-10 removes the deprecated `Customer.lastIncompleteCheckout` field and the entire `Checkout` type subtree. The field previously returned null, so this is a cleanup of stale Checkout Classic schema. Developers must update any queries that reference `lastIncompleteCheckout` or nested `Checkout` fields before upgrading. There is no direct replacement in the Customer Account API — for active cart/checkout state use Storefront API cart flows, and for purchase history use `Customer.orders`. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Checkout and Customer Account UI extensions available by default in new development shops](https://daily.dev/posts/checkout-and-customer-account-ui-extensions-available-by-default-in-new-development-shops-owartyg3h) · Shopify Developer changelog · 0 upvotes · 0 comments - [Customer Address APIs now support countryCode](https://daily.dev/posts/customer-address-apis-now-support-countrycode-py9duoxjm) · Shopify Developer changelog · 0 upvotes · 0 comments - [Built for Shopify requirements for Returns and exchanges apps and Subscription apps \(effective December 1, 2026\)](https://daily.dev/posts/built-for-shopify-requirements-for-returns-and-exchanges-apps-and-subscription-apps-effective-decem-n9m4unfee) · Shopify Developer changelog · 0 upvotes · 0 comments - [discountedUnitPrice on DraftOrderLineItem Customer Account API deprecation](https://daily.dev/posts/discountedunitprice-on-draftorderlineitem-customer-account-api-deprecation-bpdfoy67l) · Shopify Developer changelog · 0 upvotes · 0 comments - [Draft order deposit fields are now available in the GraphQL Admin API and Customer Account API](https://daily.dev/posts/draft-order-deposit-fields-are-now-available-in-the-graphql-admin-api-and-customer-account-api-p4bbot1u8) · Shopify Developer changelog · 0 upvotes · 0 comments --- Tags: [#ecommerce](https://daily.dev/tags/ecommerce), [#graphql](https://daily.dev/tags/graphql), [#shopify](https://daily.dev/tags/shopify) [View this post on daily.dev](https://daily.dev/posts/customer-account-api-customer-lastincompletecheckout-and-checkout-types-removed-in-2026-10-fhlqecth3) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Customer Account API Customer.lastIncompleteCheckout and Checkout types removed in 2026-10","url":"https://daily.dev/posts/customer-account-api-customer-lastincompletecheckout-and-checkout-types-removed-in-2026-10-fhlqecth3","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/customer-account-api-customer-lastincompletecheckout-and-checkout-types-removed-in-2026-10-fhlqecth3"},"datePublished":"2026-07-06T16:12:46.684Z","dateModified":"2026-07-06T16:13:03.378Z","description":"Shopify's Customer Account API version 2026-10 removes the deprecated `Customer.lastIncompleteCheckout` field and the entire `Checkout` type subtree. 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