Dear Maxim,
Good day! You said "we will continue supporting the application and module until Facebook removes FBML technology completely". It seems like you put the blame on Facebook and consider it as a force major but you do not inform us before hand that Facebook could stop using FBML. I would ask for the resolution not putting the blame on your team.
Subscription seems not look like the commercialized license of the rest of your previous products at all.
With best regards,
Roy
www.facebook.com/farlin and
www.facebook.com/mothersenvogue