InstantSSL certificates won't be issued to your customers right away after they purchase them, because Comodo CA needs some time to validate their requests. It doesn't give a "success" or "rejected" response immediately and returns an "unknown status" response. When Parallels H-Sphere gets this response, it:
Success: Once Parallels H-Sphere gets a confirmation about successful certificate issuance, it notifies the user, removes the task from Async. Manager, and sends the administrator an email with the list of all completed requests.
Rejected: If Parallels H-Sphere gets this response, it shows this certificate issuance as rejected and cancels the billing entry.
Async. Manager offers the following controls: