[Zope] eCommerce with Zope

Howdy! I wonder how on-the fly verification of e.g. credit cards or whatever else verification that could take some time can be done using Zope if Zope doesn't support multipart content. As a user I'd expect to get an immediate feedback like "verifying your credit card ... (please wait)" or "checking whether this domain name is available ..." and then after a while see the results without any further action. This is would be a typical job for multipart content-type, wouldn't it? Is there a workaround or so to get this done with Zope? Ragnar