curl --request GET \
  --url https://api.example.com/solana/permits/{drone_pda}

[
  {
    "permit_pda": "<string>",
    "airspace_pda": "<string>",
    "drone_pda": "<string>",
    "granted_at": 123,
    "expires_at": 123,
    "tx": {
      "signature": "<string>",
      "slot": 123,
      "confirmation": "<string>",
      "fee_lamports": 123
    }
  }
]