PaymentCheckoutComponent::getFormFields PHP Method

    public function getFormFields(Order $order)
    {
        $fields = FieldList::create();
        $gateways = GatewayInfo::getSupportedGateways();
        if (count($gateways) > 1) {
            $fields->push(OptionsetField::create('PaymentMethod', _t("CheckoutField.PaymentType", "Payment Type"), $gateways, array_keys($gateways)));
        }
        if (count($gateways) == 1) {
            $fields->push(HiddenField::create('PaymentMethod')->setValue(key($gateways)));
        }
        return $fields;
    }