[Unit]
Description=WAN IP Guard - Dynamic DNS updater
After=network-online.target
Wants=network-online.target

[Service]
Type=oneshot
# Change 'your-user' and paths to match your setup
User=your-user
EnvironmentFile=/home/your-user/wan-ip-guard/.env
WorkingDirectory=/home/your-user/wan-ip-guard
ExecStart=/usr/bin/node /home/your-user/wan-ip-guard/index.js