RTL allows the user to configure and control specific application parameters for app customization and integration.
The parameters can be configured via RTL-Config.json file or through environment variables defined at the OS level.

#### RTL-Config.json
{
  "multiPass": "<The password in plain text, default 'password'>",
  "port": "<port number for the rtl node server, default '3000'>",
  "defaultNodeIndex": <Default index to load when rtl server starts, default 1>,
  "SSO": {
    "rtlSSO": <parameter to turn SSO off/on. Allowed values - 1 (single sign on via an external cookie), 0 (stand alone RTL authentication), default 0>,
    "rtlCookiePath": "<Full path of the cookie file including the file name. The application url needs to pass the value from this cookie file as query param 'access-key' for the SSO authentication to work, Required if SSO=1 else empty>",
    "logoutRedirectLink": "<URL to re-direct to after logout/timeout from RTL, Required if SSO=1 else empty>"
  },
  "nodes": [
    {
      "index": <Incrimental Node indices starting from 1>,
      "lnNode": "<Node name to uniquely identify the node in the UI, Default 'Node 1'>",
      "lnImplementation": "<LNP implementation, Allowed values LND/CLT. Default 'LND'>",
      "Authentication": {
        "macaroonPath": "<Path for the folder containing 'admin.macaroon' file>",
        "configPath": "<Optional:Full path of the lnd.conf file including the file name, if present locally or empty>"
      },
      "Settings": {
        "userPersona": "<User persona to tailor the data on UI. Allowed values MERCHANT, OPERATOR. Default MERCHANT>",
        "themeMode": "<Theme modes, Allowed values DAY, NIGHT. Default DAY>",
        "themeColor": "<Theme colors, Allowed values PURPLE, TEAL, INDIGO, PINK. Default PURPLE>",
        "channelBackupPath": "<Optional: Path to save channel backup file. Only for LND implementation, Default <RTL root>\backup\node-1>",
        "bitcoindConfigPath": "<Optional: path of bitcoind.conf path if available locally>",
        "enableLogging": <parameter to turn RTL logging off/on. Allowed values - true, false, default false>,
        "fiatConversion": <parameter to turn fiat conversion off/on. Allowed values - true, false, default false>,
        "currencyUnit": "<Optional: Fiat current Unit for currency conversion, default 'USD' If fiatConversion is true>",
        "lnServerUrl": "<Service url for LND/CLightning REST APIs for the node, e.g. https://192.168.0.1:8080/v1 OR https://192.168.0.1:3001/v1. Default 'https://localhost:8080/v1'"
      }
    }
  ]
}

#### Environment variables
;The environment variable can also be used for all of the above configurations except the UI settings.
;If the environment variables are set, it will take precedence over the parameters in the RTL-Config.json file.
PORT (port number for the rtl node server, default 3000)
LN_IMPLEMENTATION (LND, CLT. Default 'LND')
LN_SERVER_URL (LND server URL for REST APIs, default https://localhost:8080/v1) OR LN_SERVER_URL (LN server URL for LNP REST APIs)
CONFIG_PATH (Full path of the lnd.conf file including the file name) OR CONFIG_PATH (Full path of the LNP .conf file including the file name)
MACAROON_PATH (Path for the folder containing 'admin.macaroon' file)
RTL_SSO (1 - single sign on via an external cookie, 0 - stand alone RTL authentication)
RTL_COOKIE_PATH (Full path of the cookie file including the file name)
LOGOUT_REDIRECT_LINK (URL to re-direct to after logout/timeout from RTL)
RTL_CONFIG_PATH (Path for the folder containing 'RTL-Config.json' file)
BITCOIND_CONFIG_PATH (Full path of the bitcoind.conf file including the file name)
CHANNEL_BACKUP_PATH (folder location for saving the channel backup files, valid for LND implementation only)