Stripe Checkout Extension

I am working on a Stripe Checkout Extension that redirects to the Stripe checkout page.

I have created my own extension: myvendor/StripeCheckout.

Here is the code for my StripeCheckout controller.

namespace MyVendor\StripeCheckout\Payments;

use Igniter\PayRegister\Payments\BasePaymentGateway;
use Stripe\Stripe;
use Stripe\Checkout\Session;

class StripeCheckout extends BasePaymentGateway
{
    public function getConfig()
    {
        return [
            'code' => 'stripe_checkout',
            'name' => 'Stripe Checkout',
            'description' => 'Pay with Stripe Checkout',
        ];
    }

    public function getConfigFields()
    {
        return [
            'stripe_live_secret_key' => [
                'label' => 'Live Secret Key',
                'span' => 'left',
                'type' => 'text',
            ],
            'stripe_live_publishable_key' => [
                'label' => 'Live Publishable Key',
                'span' => 'right',
                'type' => 'text',
            ],
            'stripe_test_secret_key' => [
                'label' => 'Test Secret Key',
                'span' => 'left',
                'type' => 'text',
            ],
            'stripe_test_publishable_key' => [
                'label' => 'Test Publishable Key',
                'span' => 'right',
                'type' => 'text',
            ],
            'mode' => [
                'label' => 'Mode',
                'type' => 'radio',
                'options' => [
                    'live' => 'Live',
                    'test' => 'Test',
                ],
                'default' => 'test',
            ],
        ];
    }

    public function processPaymentForm($data, $host, $order)
    {
        $mode = $this->getSetting('mode');
        $secretKey = $mode == 'live' ? $this->getSetting('stripe_live_secret_key') : $this->getSetting('stripe_test_secret_key');

        Stripe::setApiKey($secretKey);

        $session = Session::create([
            'payment_method_types' => ['card'],
            'line_items' => [[
                'price_data' => [
                    'currency' => $order->currency_code,
                    'product_data' => [
                        'name' => 'Order #' . $order->order_id,
                    ],
                    'unit_amount' => $order->order_total * 100,
                ],
                'quantity' => 1,
            ]],
            'mode' => 'payment',
            'success_url' => url('/checkout/success?session_id={CHECKOUT_SESSION_ID}'),
            'cancel_url' => url('/checkout/cancel'),
        ]);

        return redirect($session->url);
    }
}

When I try to edit payment method I get the following error:

Call to undefined method Admin\Models\Payments_model::getConfigFields()" on line 71 of /homepages/u71705/demo/vendor/laravel/framework/src/Illuminate/Support/Traits/ForwardsCalls.php#0 /homepages/u71705/demo/vendor/laravel/framework/src/Illuminate/Support/Traits/ForwardsCalls.php(36): Illuminate\Database\Eloquent\Model::throwBadMethodCallException(‘getConfigFields’)
#1 /homepages/u71705/demo/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php(2132): Illuminate\Database\Eloquent\Model->forwardCallTo(Object(Igniter\Flame\Database\Builder), ‘getConfigFields’, Array)

Thank you in advance for your help