If it's related to hosting, filters or really special send a mail to contact@flightairmap.com. Else open a new issue on github.
For now only PayPal is supported. Card will be supported asap.
You can contact us contact@flightairmap.fr, the code can be sold under Apache License 2.0 so it can be used in commercial proprietary products, without the need to give access to the source code.
Access right is based on IP. You can define up to 2 IPs that can access feeds.
It's possible, send an e-mail to contact@flightairmap.com. You need a VPS with at least 1024Mo of memory.