v2 is API-key based. To bring up a tunnel on a new client:
curl -sSL https://raw.githubusercontent.com/klan1/klan1-tunnel/main/install.sh \ | bash -s -- --device-id <name> --api-url <api-url> --api-key <key>
Active tunnels appear in the table below. Use the action column to extend, fetch the SSH command, or release.