Hello, everyone. I'm Mattias from the mobile payments company Fortumo.
We provide mobile operator billing to game and app developers - if you're selling something inside your app, our solution allows users from 80 countries to purchase it and charge the payment to their phone bill. We don't have any sign-up fees or monthly volume commitments & our business model works on a per-transaction commission basis.
The reason I'm posting is because we currently have an ongoing campaign for developers who have built apps for Windows Phone or Windows 8: if you have already had some success with your app (at least 100k downloads on WP/W8 or 1M on Android/iOS), we will cover integrating mobile payment costs up to $25K.
Technical information about our payment solutions can be found in our Developers Portal. You can check out the demo payment flow for Microsoft devices here.
If the moderators see this as an appropriate announcement and decide to keep it around, I will be happy to answer any questions on the commercial & technical side which you might have.