My cart is emptied when I reach checkout in CartV2

Hello

I have a bit of a problem, when I reach the checout step, my cart is emptied, I integrate with an unsupported gateway provider and before sending the user to this provider, the user is presented to a view, where the user clicks a button and is then send to the provder. But on this step the cart is emptied and this is misleading the customer.
My StartCheckout function holds this code:

       public override string StartCheckout(Dynamicweb.eCommerce.Orders.Order order)
        {
            LogEvent(order, "Starter checkout til RBS");

            XMLOrder orderXml = new XMLOrder("dk", "");

            string resultXml = orderXml.CreateXML(order);
            LogEvent(order, "Result XML: " + resultXml);

            string callbackUrl = CreateCallbackUrl(order);
            LogEvent(order, "Callback URL: " + callbackUrl);
            string urlToPaymentGateway = String.Empty;
            try
            {
                urlToPaymentGateway = orderXml.SendXML(resultXml, order.ID, callbackUrl);
            }
            catch (Exception e)
            {
                LogError(order, e.Message + "<br/>" + e.StackTrace + "<br/>" + e.TargetSite);
            }

            LogEvent(order, "URL til payment gateway: " + urlToPaymentGateway);

            return PrintShowPaymentMethodsTemplate(order, urlToPaymentGateway);
        }

The PrintShowPaymentMethodTemplate function holds this:

        private string PrintShowPaymentMethodsTemplate(Dynamicweb.eCommerce.Orders.Order order, string urlToPaymentGateway)
        {
            Dynamicweb.Templatev2.Template template = new Dynamicweb.Templatev2.Template("./RBS/ShowPaymentMethodsTemplate.html");

            template.SetTag("url", urlToPaymentGateway);

            return template.Output();
        }

Is there any way that I can stop the cart from being emptied when showing thix final template to the user?

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My cart is emptied when I reach checkout in CartV2

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