diff --git a/modules/services/web-apps/betanin.nix b/modules/services/web-apps/betanin.nix
index 712ad29..729db34 100644
--- a/modules/services/web-apps/betanin.nix
+++ b/modules/services/web-apps/betanin.nix
@@ -4,14 +4,27 @@ let
   inherit (lib) mkIf mkOption optionalAttrs types;
   cfg = config.services.betanin;
 
-  yaml = pkgs.formats.yaml { };
-  configFile =
-    if (cfg.beetsConfigFile != null)
-    then cfg.beetsConfigFile
-    else yaml.generate "beets-config.yaml" cfg.beetsConfig;
-
   defaultUser = "betanin";
   defaultGroup = "betanin";
+
+  finalSettings =
+    let
+      base = lib.filterAttrsRecursive (n: _: lib.hasSuffix "_file" n) cfg.settings;
+      clean = {
+        frontend.password = cfg.settings.frontend.password or "@password@";
+        clients.api_key = cfg.settings.clients.api_key or "@api_key@";
+      };
+    in
+    lib.recursiveUpdate base clean;
+
+  settingsFormat = pkgs.formats.toml { };
+  settingsFile = settingsFormat.generate "betanin.toml" finalSettings;
+
+  beetsFormat = pkgs.formats.yaml { };
+  beetsFile =
+    if (cfg.beetsFile != null)
+    then cfg.beetsFile
+    else beetsFormat.generate "betanin-beets.yaml" cfg.beetsConfig;
 in
 {
   options = {
@@ -54,25 +67,123 @@ in
         default = "/var/lib/betanin";
       };
 
+      settings = mkOption {
+        type = types.submodule {
+          freeformType = settinsgFormat.type;
+
+          frontend.username = mkOption {
+            type = types.str;
+            default = "";
+            description = "Username used to log into the frontend. Must be set.";
+          };
+
+          frontend.password = mkOption {
+            type = types.str;
+            default = "";
+            description = ''
+              Password used to log into the frontend. Either password or
+              password_file must be set.
+            '';
+          };
+
+          frontend.password_file = mkOption {
+            type = with types; nullOr (either str path);
+            default = null;
+            description = ''
+              File containing the password used to log into the frontend. The
+              file must be readable by the betanin user/group.
+
+              Using a password file keeps the password out of the Nix store, but
+              the password is still stored in plain text in the service data
+              directory.
+            '';
+          };
+
+          clients.api_key = mkOption {
+            type = types.nullOr types.str;
+            default = "";
+            description = ''
+              API key used to access Betanin (e.g., from other services).
+            '';
+          };
+
+          clients.api_key_file = mkOption {
+            type = with types; nullOr (either str path);
+            default = null;
+            description = ''
+              File containing the API key used to access Betanin (e.g., from
+              other services). The file must be readable by the betanin
+              user/group.
+
+              Using a API key file keeps the API key out of the Nix store, but
+              the API key is still stored in plain text in the service data
+              directory.
+            '';
+
+            notifications.strings.title = mkOption {
+              type = types.str;
+              default = "[betanin] torrent `$name` $status";
+              description = "Notification title.";
+            };
+
+            notifications.strings.body = mkOption {
+              type = types.str;
+              default = "@ $time. view/use the console at http://127.0.0.1:${cfg.port}/$console_path";
+              description = "Notification body.";
+            };
+          };
+        };
+        example = lib.literalExpression ''
+          {
+            frontend = {
+              username = "foo";
+              password_file = "/run/secrets/betaninPasswordFile";
+            };
+            clients = {
+              api_key_file = "/run/secrets/betaninApiKeyFile";
+            };
+            server = {
+              num_parallel_jobs = 1;
+            };
+          }
+        '';
+        description = "Configuration for betanin.";
+      };
+
       beetsConfig = mkOption {
         description = "beets configuration.";
-        type = yaml.type;
+        type = beetsFormat.type;
         default = { };
       };
 
-      beetsConfigFile = mkOption {
+      beetsFile = mkOption {
         description = "beets configuration file.";
-        type = nullOr (either str path);
+        type = with types; nullOr (either str path);
         default = null;
       };
     };
   };
 
   config = mkIf cfg.enable {
-    assertions = [{
-      assertion = (cfg.beetsConfig == { }) != (cfg.beetsConfigFile == null);
-      message = "either services.betanin.beetsConfig or services.betanin.beetsConfigFile is required";
-    }];
+    assertions = [
+
+      {
+        assertion = cfg.settings.frontend.username != "";
+        message = "services.betanin.settings.frontend.username is required";
+      }
+      {
+        assertion = (cfg.settings.frontend.password == "") != (cfg.settings.frontend.password_file);
+        message = "services.betanin.settings.frontend.password or services.betanin.settings.frontend.password_file is required";
+      }
+      {
+        assertion = (cfg.settings.clients.api_key == "") != (cfg.settings.clients.api_key_file);
+        message = "services.betanin.settings.clients.api_key or services.betanin.settings.clients.api_key_file is required";
+      }
+      {
+        assertion = (cfg.beetsConfig == { }) != (cfg.beetsFile == null);
+        message = "either services.betanin.beetsConfig or services.betanin.beetsFile is required";
+      }
+    ];
 
     networking.firwall = mkIf cfg.openFirewall {
       allowedTCPPorts = [ cfg.port ];
@@ -85,11 +196,29 @@ in
       environment = {
         HOME = cfg.dataDir;
       };
+
+      script = ''
+        #!/bin/sh
+        mkdir -p ${cfg.dataDir}/.config/betanin
+        mkdir -p ${cfg.dataDir}/.config/beets
+        mkdir -p ${cfg.dataDir}/.local/share/betanin
+        cat ${settingsFile} > ${cfg.dataDir}/.config/betanin/config.toml
+        ln -sf ${beetsFile} ${cfg.dataDir}/.config/betanin/config.toml
+      '' ++ lib.optionalString (cfg.settings.frontend.password_file != null) ''
+        sed -i "s/@password@/$(cat ${cfg.settings.frontend.password_file})/" \
+          ${cfg.dataDir}/.config/betanin/config.toml
+      '' ++ lib.optionalString (cfg.settings.frontend.api_key_file != null) ''
+        sed -i "s/@api_key@/$(cat ${cfg.settings.frontend.api_key_file})/" \
+          ${cfg.dataDir}/.config/betanin/config.toml
+      '' ++ ''
+        chmod -w ${cfg.dataDir}/.config/betanin/config.toml
+        ${cfg.package}/bin/betanin --port ${cfg.port}
+      '';
+
       serviceConfig = lib.mkMerge [
         {
           User = cfg.user;
           Group = cfg.group;
-          ExecStart = "${cfg.package}/bin/betanin --port ${cfg.port}";
           PrivateTmp = true;
           Restart = "always";
           WorkingDirectory = cfg.dataDir;