Get modifier
## Get modifier by ID
Fetches a single modifier by its `id`, including its `options`, scoped to the authenticated merchant's store.
### Authentication
- Merchant API key in **`x-api-key`** (alias `x-account-api-key`).
- Requires **`Merchant.product.read`**.
### Path params
- `id` — the modifier UUID.
### Behavior
If the modifier does not exist for the caller's store the API responds **400 Bad Request** (`Modifier with id <id> not found`).
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**Notas:** Handler: modifierService.findOne -> findAndValidateOne. A modifier from another store returns 400 (BadRequestException), not 404/403.
Authentication
x-api-keystring
API Key authentication via header
Path parameters
id
The modifier UUID. Must belong to the authenticated store.
Headers
x-application-account-id
Scope the request to a specific store / account instead of the one resolved from the API key. Aliases: the x-account-id header, or the application_account_id / account_id query parameter.