Class 'Paystack' not found

After following all the direction on git on unicodeveloper/laravel-paystack set up,created paystack.php in config,adding 'Paystack' => Unicodeveloper\Paystack\Facades\Paystack::class in alliases and add class in providers, I still have error Class 'Paystack' not found.

I have tried everything possible but to no avail, I added Unicodeveloper\Paystack\Paystack::genTranxRef() the full path inline in the form and it worked but got a different error 'Non-static method Unicodeveloper\Paystack\Paystack::genTranxRef() should not be called statically'

form input: <input type="hidden" name="reference" value="">

Controller use Illuminate\Http\Request; use \Unicodeveloper\Paystack\Paystack;

use App\Http\Requests; use App\Http\Controllers\Controller;

`class PaymentController extends Controller { /** * Redirect the User to Paystack Payment Page * @return Url */

public function redirectToGateway(Request $request)
{
    $paystack = new Paystack();
    $user = Auth::user();
    $request->email = $user->email;
    $request->orderID = '3';
    $request->amount = '200000';
    $request->quantity = '1';
    $request->reference = $paystack->genTranxRef();
    $request->key = config('paystack.secretKey');
    return $paystack->getAuthorizationUrl()->redirectNow();

} 

/**
 * Obtain Paystack payment information
 * @return void
 */
public function handleGatewayCallback(Request $request)
{
    $paystack = new Paystack();
    $paymentDetails = Paystack::getPaymentData();

    dd($paymentDetails);
    // Now you have the payment details,
    // you can store the authorization_code in your db to allow for      enter code hererecurrent subscriptions
    // you can then redirect or do whatever you want
}

}`

via Chebli Mohamed