---
title: MetafieldDefinitionConstraintSubtypeIdentifier - GraphQL Admin
description: The input fields used to identify a subtype of a resource for the purposes of metafield definition constraints.
api_version: 2025-10
api_name: admin
type: input-object
api_type: graphql
source_url:
  html: https://shopify.dev/docs/api/admin-graphql/latest/input-objects/MetafieldDefinitionConstraintSubtypeIdentifier
  md: https://shopify.dev/docs/api/admin-graphql/latest/input-objects/MetafieldDefinitionConstraintSubtypeIdentifier.md
---

# Metafield​Definition​Constraint​Subtype​Identifier

input\_object

The input fields used to identify a subtype of a resource for the purposes of metafield definition constraints.

## Fields

* key

  [String!](https://shopify.dev/docs/api/admin-graphql/latest/scalars/String)

  non-null

  The category of the resource subtype.

* value

  [String!](https://shopify.dev/docs/api/admin-graphql/latest/scalars/String)

  non-null

  The specific subtype value within the identified subtype category.

***

## Map

No referencing types