The menu selection that triggered the application of this discount.
| quantity | number <double> The quantity ordered of the selection that triggered the applied discount. |
object (ExternalReference) A wrapper object with fields that allow reference to a Toast entity by Toast GUID. |
{- "selection": {
- "guid": "string",
- "entityType": "string",
- "externalId": "string"
}, - "quantity": 0
}