---
title: CartMetafieldsSetPayload - Storefront API
description: Return type for `cartMetafieldsSet` mutation.
api_version: 2026-01
api_name: storefront
type: payload
api_type: graphql
source_url:
  html: https://shopify.dev/docs/api/storefront/latest/payloads/cartmetafieldssetpayload
  md: https://shopify.dev/docs/api/storefront/latest/payloads/cartmetafieldssetpayload.md
---

# Cart​Metafields​Set​Payload

payload

Return type for `cartMetafieldsSet` mutation.

## Fields

* metafields

  [\[Metafield!\]](https://shopify.dev/docs/api/storefront/latest/objects/Metafield)

  Token access required

  The list of cart metafields that were set.

* user​Errors

  [\[Metafields​Set​User​Error!\]!](https://shopify.dev/docs/api/storefront/latest/objects/MetafieldsSetUserError)

  non-null

  The list of errors that occurred from executing the mutation.

***

## Mutations with this payload

* [cart​Metafields​Set](https://shopify.dev/docs/api/storefront/latest/mutations/cartMetafieldsSet)

  mutation

  Sets [`Metafield`](https://shopify.dev/docs/api/storefront/2026-01/objects/Metafield) values on a cart, creating new metafields or updating existing ones. Accepts up to 25 metafields per request.

  Cart metafields can automatically copy to order metafields when an order is created, if there's a matching order metafield definition with the [cart to order copyable](https://shopify.dev/docs/apps/build/metafields/use-metafield-capabilities#cart-to-order-copyable) capability enabled.

  ***

  **Note:** This mutation doesn\&#39;t trigger \<a href="https://shopify.dev/docs/api/functions">Shopify Functions\</a>. Changes aren\&#39;t available to Shopify Functions until the buyer goes to checkout or performs another cart interaction that triggers the functions.

  ***

  * metafields

    [\[Cart​Metafields​Set​Input!\]!](https://shopify.dev/docs/api/storefront/latest/input-objects/CartMetafieldsSetInput)

    required

    ### Arguments

    The list of Cart metafield values to set. Maximum of 25.

    The input must not contain more than `250` values.

  ***

***

## Map

### Mutations with this payload

* [cart​Metafields​Set](https://shopify.dev/docs/api/storefront/latest/types/cartMetafieldsSet)