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41 changes, 41 breaking, breaking first, read from https://shopify.dev/changelog. The words and the dates are the source's; the severity is reef's.

AllBreakingNotable
  1. breaking
    Securing your app, together · Platform
  2. breaking
    Global Catalog REST API stops serving traffic on November 2, 2026 · effective · Catalog
  3. breaking
    New `owner_type` field for metafield declarations in Checkout and Customer Account UI extensions, required in 2027-01 · Checkout-UI, Customer-Accounts
  4. breaking
    POS UI extensions now return percentage values for percentage discounts · POS-Extensions
  5. breaking
    Cart mutations reject unconfirmed writes in POS UI extensions 2026-10 · POS-Extensions
  6. breaking
    Updated function syntax on the segment query language · GraphQL-Admin-API
  7. breaking
    Tax webhook summary and calculation requests now use Global IDs · GraphQL-Admin-API, Events-&-webhooks
  8. breaking
    SMS marketing consent now available on the CustomerPhoneNumber object · GraphQL-Admin-API, Customer-Account-API
  9. breaking
    New SubscriptionContractCalculation API for subscription management · GraphQL-Admin-API, Functions
  10. breaking
    `metafieldInteger` collection condition removed in API version 2027-01 · GraphQL-Admin-API
  11. breaking
    Discounts can now be included in Rollouts · GraphQL-Admin-API
  12. breaking
    AI Toolkit skills have been consolidated to `shopify` · AI-Toolkit
  13. breaking
    Removing marketCurrencySettingsUpdate mutation · GraphQL-Admin-API
  14. breaking
    Events subscription query complexity limit is changing to 100 points · Events-&-webhooks
  15. breaking
    The `automaticDiscounts` query is removed in API version 2027-01 · GraphQL-Admin-API
  16. breaking
    Removed session.currentSession.staffMemberId from POS UI Extensions (2026-10) · POS-Extensions
  17. breaking
    Updates to Events payloads and subscription configuration · Events-&-webhooks
  18. breaking
    Discounts Allocator Function API developer preview has ended · GraphQL-Admin-API, Functions
  19. breaking
    Variants now support multiple barcodes · GraphQL-Admin-API
  20. breaking
    Customer Address APIs now support countryCode · Checkout-UI, Customer-Account-API, Customer-Accounts
  21. breaking
    Password Protected Shop Dev flows on Shopify Theme CLI v3.83.x and older to be deprecated · effective · Themes
  22. breaking
    Script tags are deprecated and will stop running on March 1, 2027 · effective · GraphQL-Admin-API, Admin-REST-API
  23. breaking
    Updating an order's shipping address recalculates taxes as of API version 2026-10 · GraphQL-Admin-API, Admin-REST-API
  24. breaking
    Invalid metafield queries now return errors in the GraphQL Admin API · effective · Admin-GraphQL-API, Metafields-and-metaobjects
  25. breaking
    Identity verification for Shopify Partners starts today · Platform
  26. breaking
    POS UI extensions 2026-07 uses per-unit fixed-amount line item discounts · POS-Extensions
  27. breaking
    Shopify Flow: Changes to Action extensions result in fewer breaking changes · Tools
  28. breaking
    Customer Account API Customer.lastIncompleteCheckout and Checkout types removed in 2026-10 · Customer-Account-API
  29. breaking
    OrderDisplayFulfillmentStatus now returns FULFILLMENT_NOT_REQUIRED for orders with no items to fulfill · Admin-GraphQL-API
  30. breaking
    Deprecating the useBuyerJourneyIntercept API on checkout UI extensions · Polaris
  31. breaking
    Merchant-owned delivery profile APIs are deprecated for market-driven shipping · Admin-GraphQL-API
  32. breaking
    Market-driven shipping now available in feature preview · effective · sunset · Admin-GraphQL-API
  33. breaking
    `discountedUnitPrice` on `DraftOrderLineItem` Customer Account API deprecation · Customer-Account-API
  34. breaking
    Deprecation of cumulative marketing engagements · Admin-GraphQL-API
  35. breaking
    Storefront MCP cart tools are being deprecated in favour of UCP Cart MCP · effective · Platform
  36. breaking
    `DraftOrderDiscountNotAppliedWarning.priceRule` removed in GraphQL Admin API 2026-10 · Admin-GraphQL-API
  37. breaking
    Removal of ITEM_NOT_STOCKED_AT_LOCATION error · Admin-GraphQL-API
  38. breaking
    WhatsApp marketing consent now available in the Admin API and Customer Account API · Admin-GraphQL-API, Customer-Account-API, Events-&-webhooks
  39. breaking
    New Collection model and APIs now available · Admin-GraphQL-API, Functions
  40. breaking
    Built for Shopify requirements for Returns and exchanges apps and Subscription apps (effective December 1, 2026) · effective · Built-for-Shopify
  41. breaking
    Metafields now require a definition to be accessed through the Customer Account API · Platform