Paypal api – Laravel making credit card payment with paypal returns unauthorized payment

I’m trying to integrate Paypal as the payment gateway in my Laravel 5.8 website. In order to do so I’m using the Laravel-Omnipay package which offers Omnipay integration into Laravel.

As for my Paypal business account, I’ve set up my credentials. Using the paypal sandbox with the following code works:

Route::get('paypal', function() {
    $gateway = Omnipay::create('PayPal_Rest');

    $gateway->initialize(array(
        'clientId' => 'MySandboxClientId',
        'secret'   => 'MySandboxSecret',
        'testMode' => true,
    ));
    $card = new CreditCard(array(
        'firstName' => 'first name',
        'lastName' => 'last name',
        'number' => '5498876202508868',
        'cvv' => '123',
        'expiryMonth'           => '09',
        'expiryYear'            => '2024',
        'billingAddress1'       => '1 Scrubby Creek Road',
        'billingCountry'        => 'AU',
        'billingCity'           => 'Scrubby Creek',
        'billingPostcode'       => '4999',
        'billingState'          => 'QLD',
    ));
    try {
        $transaction = $gateway->purchase(array(
            'amount'        => '10.00',
            'currency'      => 'USD',
            'description'   => 'This is a test purchase transaction.',
            'card'          => $card,
        ));
        $response = $transaction->send();
        $data = $response->getData();
        dd($data);
        echo "Gateway purchase response data == " . print_r($data, true) . "n";

        if ($response->isSuccessful()) {
            echo "Purchase transaction was successful!n";
        }
    } catch (Exception $e) {
        echo "Exception caught while attempting authorize.n";
        echo "Exception type == " . get_class($e) . "n";
        echo "Message == " . $e->getMessage() . "n";
    }
});

However, when I try to pass to a live payment using my own credit card. I can an Unauthorized payment. error. The code I’m using is the same as above, I’m just replacing the clientId and secret with my live sandbox credentials.

How can I make a live call to the REST Api. I need to make a $1 transaction so I can test whether the card is valid or not.