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Update Cart Metafield

API operation: Open the endpoint in Scalar

Use PUT /carts/{cart_id}/metafields/{metafield} to update a cart metafield. The operation documented here is CartMetafield.update.

Parameter: {metafield} identifies the metafield to update on the selected cart.

The documented schema requires authentication, resolves the cart by UUID and user, and scopes the metafield by cart identity.

See Cart model and Extra attributes (Metafields).