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

    public function actionLogin()
    {
        $model = new LoginForm();
        $model->load(Yii::$app->request->post(), '');
        if ($model->login()) {
            return ['status' => 'success', 'data' => ['token' => $model->user->access_token]];
        } else {
            return ['status' => 'fail', 'data' => ['errors' => $model->getFirstErrors()]];
        }
    }