curl --request GET \
  --url https://app.flowglad.com/api/v1/discounts/{id} \
  --header 'Authorization: <api-key>'

{
  "discount": {
    "id": "<string>",
    "createdAt": "<string>",
    "updatedAt": "<string>",
    "createdByCommit": "<string>",
    "updatedByCommit": "<string>",
    "livemode": true,
    "organizationId": "<string>",
    "name": "<string>",
    "code": "<any>",
    "amount": "<any>",
    "amountType": "percent",
    "active": true,
    "duration": "<string>",
    "numberOfPayments": null
  }
}