curl --request GET \
  --url https://api.headlesscommerce.io/v1/admin/discounts/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "name": "<string>",
  "description": "<string>",
  "code": "<string>",
  "type": "code",
  "value_type": "fixed",
  "value": 123,
  "target": "order",
  "usage_limit": 123,
  "usage_count": 123,
  "per_customer_limit": 123,
  "minimum_amount": {
    "amount": 123,
    "currency": "<string>"
  },
  "maximum_discount": {
    "amount": 123,
    "currency": "<string>"
  },
  "starts_at": "2023-11-07T05:31:56Z",
  "ends_at": "2023-11-07T05:31:56Z",
  "is_active": true,
  "conditions": [
    {
      "id": "<string>",
      "type": "product",
      "operator": "in",
      "values": [
        "<string>"
      ]
    }
  ],
  "metadata": {},
  "created_at": "2023-11-07T05:31:56Z"
}