Do you have good suggestions for …

… a tool to handle digital downloads for sale. I am mainly interested in handling monthly subscriptions.

On my previous post I mention the launch of the Beta program for our Jewelry Assembly Management System. Well, once the beta is over I plan to sell it, both as one time payment (as most software apps) as well as a subscription offer. I am developing the application in Adobe AIR, so I need the subscription management platform to have an API that my application can talk to, to verify that users are up-to-date with their subscriptions.

If you happen to know a tool, system, platform… preferably a hosted cloud solution, please let me know. I will appreciate the help here.