nixos-config/nixos/legacy/scanner.nix

{ config, lib, pkgs, ... }:
{
  services.grocy-scanner = {
    enable = true;
    host = "https://grocy.ingolf-wagner.de";
    device = "/dev/input/by-id/usb-Belon.cn_2.4G_Wireless_Device_Belon_Smart-event-kbd";
    apiKeyFile = toString (pkgs.writeText "key" "my-api-key-not");
  };
}