curl --request POST \
  --url https://sandbox.users.niobi.co/api/niobi-signature \
  --header 'Content-Type: application/json' \
  --data '
{
  "client_id": "K1PoY1WYricSpXh6Wm24txxxxxxxxxx",
  "sender": "Niobi integration",
  "salt": "mySalt12342423",
  "params": {
    "test": 123
  }
}
'

{
  "success": true,
  "message": "Signature was generated successfully.",
  "data": {}
}