I'm trying to use a Alias defined in boot() plugin method as follow:

public function boot()
{
    \App::register('Ignited\LaravelOmnipay\LaravelOmnipayServiceProvider');
    \Illuminate\Foundation\AliasLoader::getInstance()->alias('Omnipay', 'Ignited\LaravelOmnipay\Facades\OmnipayFacade');
    UserModel::extend(function($model){
        $model->hasMany['payment'] = ['Alomicuba\BalanceRecharge\Models\Payment'];
    });
}

Then on the onRun() method from the component I'm doing this:

public function onRun()
{
    $step = $this->param('step');
    $sandboxMode = Settings::get('sandbox_enabled');
    $gateway = Omnipay::create('PayPal_Express');
    $sandboxMode ? $gateway->setUsername(Settings::get('ppal_api_username_sandbox')) : $gateway->setUsername(Settings::get('ppal_api_username'));
    $sandboxMode ? $gateway->setPassword(Settings::get('ppal_api_password_sandbox')) : $gateway->setPassword(Settings::get('ppal_api_password'));
    $sandboxMode ? $gateway->setSignature(Settings::get('ppal_api_signature_sandbox')) : $gateway->setSignature(Settings::get('ppal_api_signature'));
    $this->page['step'] = $step;
}

But I'm getting an error on this line $gateway = Omnipay::create('PayPal_Express'); , can I not use this alias from there? Where is the problem?

Error message?

Can not find OmniPay class, I move to another Laravel package that use Omnipay but now I'm having another issue, I opened a new post at Stackoverflow, can you take a look?