Developer guide

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shopify functionscheckout validationshopify plus

How to Block a Shopify Checkout with a Cart and Checkout Validation Function

A developer walkthrough of Shopify's Cart and Checkout Validation Function: the input and output shape, how to return a validation error to block an order, the execution budget, and the metafield pre-stage pattern for live data like margin.

Herzel Mishel·May 29, 2026

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