curl --request GET \
  --url {schemes}://api.upsun.com/organizations/{organization_id}/vouchers \
  --header 'Authorization: Bearer <token>'

{
  "uuid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "vouchers_total": "<string>",
  "vouchers_applied": "<string>",
  "vouchers_remaining_balance": "<string>",
  "currency": "<string>",
  "vouchers": [
    {
      "code": "<string>",
      "amount": "<string>",
      "currency": "<string>",
      "orders": [
        {
          "order_id": "<string>",
          "status": "<string>",
          "billing_period_start": "<string>",
          "billing_period_end": "<string>",
          "order_total": "<string>",
          "order_discount": "<string>",
          "currency": "<string>"
        }
      ]
    }
  ],
  "_links": {
    "self": {
      "href": "<string>"
    }
  }
}