Update Brand Metafield
Updates a brand metafield.
**Required Fields**
* none
**Read-Only Fields**
* id
* These fields can only be modified by the app (API credentials) that created the metafield:
* namespace
* key
* permission_set
**Usage Notes**
* Attempting to modify `namespace`, `key`, and `permission_set` fields using a client ID different from the one used to create those metafields will result in a 403 error message.
* 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](https://support.bigcommerce.com/s/article/Platform-Limits) in the Help Center.