{
  description = "BTCPay Server NixOS module";
  
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
    nix-bitcoin.url = "github:fort-nix/nix-bitcoin/release";
  };

  outputs = { self, nixpkgs, nix-bitcoin, ... }: {
    # Export a module for others to use
    nixosModules.btcpay-server = { config, lib, pkgs, ... }: {
      imports = [ nix-bitcoin.nixosModules.default ];
      
      options.services.btcpay-full = {
        enable = lib.mkEnableOption "BTCPay Server with Bitcoin node";
      };
      # Disable debugfs mount in LXC containers
      config = lib.mkIf config.services.btcpay-full.enable {
        nix-bitcoin.generateSecrets = true;
        nix-bitcoin.operator = {
          enable = true;
          name = "btcpay";
        };
        
        services.bitcoind = {
          enable = true;
          prune = 100000;
          dbCache = 8000;
          rpc.port = 8332;
        };
        
        # Enable BTCPay Server with network binding
        services.btcpayserver = {
          enable = true;
          # Configure BTCPay Server to listen on all interfaces
          address = "0.0.0.0";
          port = 23000;
        };

        
        networking.firewall.allowedTCPPorts = [
          config.services.btcpayserver.port
          config.services.bitcoind.port
        ];
      };
    };

    # System configuration for deployment - REMOVED duplicate nix-bitcoin import
    nixosConfigurations.btcpay = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
        ({ ... }: {
          # Minimal system configuration for containers
          boot.isContainer = true;
          system.stateVersion = "25.05";
          
          # Enable our BTCPay service
          services.btcpay-full.enable = true;
          
          # Basic SSH access
          services.openssh = {
            enable = true;
            settings = {
              PermitRootLogin = "yes";
              PasswordAuthentication = true;
            };
          };
        })
        # This module already imports nix-bitcoin.nixosModules.default
        self.nixosModules.btcpay-server
      ];
    };
  };
}