filter( 'tpsa_settings_option', [$this, 'extend_pro_settings'] ); } public function extend_pro_settings( $settings ) { $settings['firewall-malware']['sub'] = [ 'web-application-firewall' => array( 'label' => __( 'Web Application Firewall', 'admin-safety-guard' ), 'is_pro' => true, ), ]; return $settings; } }