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Set product categories on custom line items in draft orders and order edits

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Shopify·Oct 21, 2026, 01:00 PMFeatureAI-assisted summary

Summary

Introduced productCategoryId field for DraftOrderLineItemInput and orderEditAddCustomItem to assign Standard Product Taxonomy categories to custom line items.
Added productCategory fields on DraftOrderLineItem, CalculatedDraftOrderLineItem, and CalculatedLineItem for reading the assigned category (null for variant items).
Category now drives tax treatment for custom line items, with invalid categories returning a user error, especially for Managed Taxes.

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Official source Last checked Oct 22, 2026, 8:00 AM

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AI-assisted summarysource healthyLast checked Oct 22, 2026, 8:00 AM

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