curl --request GET \
  --url https://public-api.stora.co/2025-09/coupons/{coupon_id} \
  --header 'Authorization: Bearer <token>'

{
  "coupon": {
    "id": "cpn_bdc9397d53d9bfc3",
    "amount": {
      "amount": 500,
      "currency": "GBP",
      "formatted": "£5.00"
    },
    "auto_apply_to": {
      "products": false,
      "protections": false,
      "subscriptions": true,
      "unit_types": false
    },
    "billing_period": null,
    "code": "5OFF",
    "created_at": "2025-02-22T14:41:00Z",
    "duration": "forever",
    "max_redemptions": null,
    "months": null,
    "name": "£5.00 off",
    "public": false,
    "title": null,
    "type": "amount",
    "updated_at": "2025-02-22T14:41:00Z"
  },
  "meta": {
    "request_id": "01563646-58c1-4607-8fe0-cae3e92c4477",
    "curies": [
      {
        "name": "bo",
        "href": "https://app.stora.test{rel}",
        "templated": true,
        "title": "Backoffice"
      },
      {
        "name": "sf",
        "href": "https://acme.stora.test{rel}",
        "templated": true,
        "title": "Storefront"
      }
    ]
  }
}