Update Product Metafield
Updates a *Product Metafield*.
**Required Fields**
* none
**Read-Only Fields**
* id
* These fields can only be modified using the API account that created the metafield:
* `namespace`
* `key`
* `permission_set`
* `value`
**Usage Notes**
* Attempting to modify the `namespace`, `key`, `permission_set`, or `value` field using an API account different from the one used to create those metafields will result in a `403` error message.