The Firewall Manager API project installation begins by cloning the repository from GitHub. Next, the .env file needs editing to match the user's specific configuration. Docker Compose is used to start the API, running it in detached mode. The status of the running containers can be verified using the 'docker ps' command. To set up the firewall client, install the provided agent on the node server. Configuration involves creating a group and API key within the Firewall Manager, then editing the config.ini file on the node server with the API URL, API key, and hostname. Restart the firewall agent to apply changes and confirm its status. SIEM integration requires configuring the SIEM to send logs to the Firewall Manager using a specific POST request format detailed in the documentation. The Swagger documentation, available at the provided link, offers further details. Default credentials are provided, but can be changed in the settings. Finally, the project maintainers welcome sponsorship through GitHub Sponsors.