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Storefront API now returns a specific error code when Cart Transform Functions fail

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Shopify·7 months ago · Jan 21, 2026, 05:00 PMFeatureAI-assisted summary

Summary

Storefront API now returns MERCHANDISE_LINE_TRANSFORMERS_RUN_ERROR for Cart Transform Function runtime errors
Replaces the generic INVALID error, allowing developers to distinguish transform failures from other cart errors
Enables more precise error handling and debugging for cartCreate, cartLinesAdd, and related operations

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