Upsert brand
Creates or updates a brand based on the brand's `reference_id`.
If a brand with a matching `reference_id` is found,
it will be updated. Ensure proper mapping; if no matching brand is found,
a new one will be created.
The HTTP response code (`200 OK` or `201 Created`) indicates
whether the resource was updated or created, respectively.
<Note>
`brand_id` is the primary unique identifier for all Brand APIs.
Be cautious when using `reference_id` as a unique identifier.
</Note>
**This endpoint is not rate limited.**
Scopes: `BRANDS_WRITE`