curl --request GET \
  --url https://apidev.nusd.me/nps/bill/funds \
  --header 'BIZ-API-KEY: <api-key>' \
  --header 'Biz-Api-Nonce: <api-key>' \
  --header 'Biz-Api-Signature: <api-key>'

{
  "status": 0,
  "data": {
    "total": 7,
    "total_amount_in": "12.664",
    "total_amount_out": "5.00303",
    "funds": [
      {
        "wallet_id": "332cf3e4-af07-46f9-a3da-4aa2cbe3bdd4",
        "transaction_id": "aabc16f2-50e2-45f5-b28e-5f1a3595b347",
        "type": "Deposit",
        "amount": "9.9",
        "balance_before": "0",
        "balance_after": "9.9",
        "created_at": 1762985211,
        "confirmed_at": 1770031726
      }
    ]
  },
  "msg": "<string>"
}