message: app.json - network type
diff: "SPREAD": {
  "description": "The spread (commission) you want to earn from every trade",
  "value": "5"
  - }
  + },
  + "NETWORK": {
  + "description": "Network type (MAINNET or TESTNET)",
  + "value": "MAINNET"
  + },
  }
  }
  