curl --request GET \
  --url https://merits.blockscout.com/admin/api/v1/offers/{offer_id}/secrets \
  --header 'Authorization: <api-key>'

{
  "items": [
    {
      "secret_id": 123,
      "offer_id": "<string>",
      "details": "<string>",
      "is_redeemed": true
    }
  ],
  "next_page_params": {
    "page_token": "<string>",
    "page_size": 123
  }
}