- Removed the deprecated Customer.lastIncompleteCheckout field and its Checkout type subtree from the Customer Account API version 2026-10.
- Queries that reference Customer.lastIncompleteCheckout or any nested Checkout fields will now fail and must be updated before upgrading.
- Use Storefront API cart flows for active cart state or Customer.orders for purchase history, as there is no direct replacement in the Customer Account API.
Customer Account API Customer.lastIncompleteCheckout and Checkout types removed in 2026-10
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