ValidationUserError

Creates a cart and checkout validation: a server-side rule enforced before a customer can complete checkout. Each validation is powered by a cart and checkout validation function that you provide using functionId or functionHandle.

Use validationCreate to apply custom rules at checkout, such as limiting item quantities, enforcing order minimums or maximums, or blocking checkout for restricted shipping addresses. Validations run on Shopify's servers and are enforced throughout checkout, so they can't be bypassed by the client.

Validation errors always block checkout progress. The blockOnFailure field controls whether runtime exceptions, such as timeouts, also block checkout.

Deletes a cart and checkout validation, removing its rule from the shop's checkout. Once deleted, its cart and checkout validation function no longer runs during checkout.

Updates a cart and checkout validation. Use validationUpdate to rename it, toggle whether it's enabled at checkout, change its blockOnFailure behavior, or update its metafields.

Validation errors always block checkout progress. The blockOnFailure field controls whether runtime exceptions, such as timeouts, also block checkout.