m\modules\v1\controllers\DefaultController::actions PHP Method

    public function actions()
    {
        return ['captcha' => ['class' => 'yii\\captcha\\CaptchaAction', 'fixedVerifyCode' => YII_ENV_TEST ? 'testme' : null, 'width' => 80, 'height' => 27, 'padding' => 1, 'offset' => 1, 'backColor' => 0xffffff, 'foreColor' => 0xe50a4a, 'minLength' => 4, 'maxLength' => 4]];
    }