PaymentCheckoutComponent::validateData PHP Method

    public function validateData(Order $order, array $data)
    {
        $result = ValidationResult::create();
        if (!isset($data['PaymentMethod'])) {
            $result->error(_t('PaymentCheckoutComponent.NoPaymentMethod', "Payment method not provided"), "PaymentMethod");
            throw new ValidationException($result);
        }
        $methods = GatewayInfo::getSupportedGateways();
        if (!isset($methods[$data['PaymentMethod']])) {
            $result->error(_t('PaymentCheckoutComponent.UnsupportedGateway', "Gateway not supported"), "PaymentMethod");
            throw new ValidationException($result);
        }
    }