protected function set_installed_apis() {
		if ( file_exists( __DIR__ . '/API/Bitbucket_API.php' ) ) {
			self::$installed_apis['bitbucket_api'] = true;
			self::$git_servers['bitbucket']        = 'Bitbucket';
		} else {
			self::$installed_apis['bitbucket_api'] = false;
		}

		self::$installed_apis['bitbucket_server_api'] = file_exists( __DIR__ . '/API/Bitbucket_Server_API.php' );

		if ( file_exists( __DIR__ . '/API/GitLab_API.php' ) ) {
			self::$installed_apis['gitlab_api'] = true;
			self::$git_servers['gitlab']        = 'GitLab';
		} else {
			self::$installed_apis['gitlab_api'] = false;
		}
		if ( file_exists( __DIR__ . '/API/Gitea_API.php' ) ) {
			self::$installed_apis['gitea_api'] = true;
			self::$git_servers['gitea']        = 'Gitea';
		} else {
			self::$installed_apis['gitea_api'] = false;
		}
		if ( file_exists( __DIR__ . '/API/Zipfile_API.php' ) ) {
			self::$installed_apis['zipfile_api'] = true;
			self::$git_servers['zipfile']        = 'Zipfile';
		} else {
			self::$installed_apis['zipfile_api'] = false;
		}
	}