Create a Category Metafield

Creates a *Category Metafield*. **Required Fields:** - permission_set - namespace - key - value **Read-Only Fields** - id **Note:** The maximum number of metafields allowed on each order, product, category, variant, or brand is 250 per client ID. For more information, see [Platform Limits (Help Center)](https://support.bigcommerce.com/s/article/Platform-Limits) in the Help Center.