Получение значений для передачи в Payfast

Я пытаюсь интегрировать Payfast с моим проектом laravel. Проблема, с которой я столкнулся, заключается в том, что данные не передаются в Payfast, поэтому Payfast продолжает выдавать мне сообщение об ошибке The supplied variables are not according to specification:

Вот мой код в моем контроллере

public function payPayfast(Request $request)
{
    $data = [
        'merchant_id' => $request->merchant_id,
        'merchant_key' => $request->merchant_key,
        'return_url' => $request->return_url,
        'cancel_url' => $request->cancel_url,
        'm_payment_id' => $request->m_payment_id,
        'amount' => $request->amount,
        'item_name' => 'Test Item From Controller',
        'item_description' => 'This is a test product',
        'email_confirmation' => '1',
        'confirmation_address' => '',
        'payment_method' => $request->payment_method,
        'signature' => $request->signature,
    ];

    return redirect()->to('https://sandbox.payfast.co.za/eng/process')->with('data', $data);
}

вот мой код в моем подтверждении.blade.php

<div class = "content_wrapper">
    <h1>Order Confrimation</h1>

    <div class = "row">
        <div class = "col-lg-12">
            <form action = "{{ route('payfast.payPayfast') }}" method = "POST">
                @csrf
                <input type = "hidden" name = "merchant_id" value = "11111111">
                <input type = "hidden" name = "merchant_key" value = "2222222222222">
                <input type = "hidden" name = "return_url" value = "{{ route('payfast.success') }}">
                <input type = "hidden" name = "cancel_url" value = "{{ route('payfast.cancel') }}">
                <input type = "hidden" name = "notify_url" value = "{{ route('payfast.notify') }}">
                <input type = "hidden" name = "m_payment_id" value = "01AB">
                <input type = "hidden" name = "amount" class = "completePrice" value = "{{ $total }}">
                <input type = "hidden" name = "item_name" value = "Test Item">
                <input type = "hidden" name = "item_description" value = "A test product">
                <input type = "hidden" name = "email_confirmation" value = "1">
                <input type = "hidden" name = "confirmation_address" value = "[email protected]">
                <input type = "hidden" name = "payment_method" value = "eft">

                <?php
                    $success = url('payfast-success');
                    $cancel = url('payfast-cancel');
                    $notify = url('payfast-notify');
                    $original_str = getAscii('merchant_id=11111111&merchant_key=2222222222222&return_url='.$success.'&cancel_url='.$cancel.'&notify_url='.$notify.'&m_payment_id=01AB&amount='.$totalPrice.'&item_name=Test Item&item_description=A test product&email_confirmation=1&[email protected]&payment_method=eft');
                    $hash_str = hash('MD5', $original_str);
                    $hash = strtolower($hash_str);
                ?>

                <input type = "hidden" name = "signature" value = "{{ $hash }}">

                <button class = "btn btn-dark" type = "submit"><img src = "{{ asset('img/eft-payfast.jpg') }}"></button>
            </form>            
        </div>
    </div>
</div>