| Name | Type | Description | Notes |
|---|---|---|---|
| is_used | bool | Flag indicating whether the voucher is used | [optional] |
| used_by_customer_id | int | Indicates Customer that used the voucher. | [optional] |
| transaction_key | string | An opaque string, to ensure idempotency. This allows for safely retrying requests without accidentally performing the same stamp operation twice. This will typically contain the the ID of the sale order. | [optional] |