curl --request DELETE \
  --url https://api.fungies.io/v0/offers/{offerId}/keys/removeAllUnsold \
  --header 'x-fngs-public-key: <api-key>' \
  --header 'x-fngs-secret-key: <api-key>'

{
  "status": "<string>",
  "data": {
    "success": true
  }
}