Which part of the project is this related to?
Survival, SkyBlock
Detailed description of the idea (1 idea - 1 post)
If a player has the /fly service, entering this command (as it is now) would turn flying on/off. If a player does not have the /fly service, entering this command would display in chat "You do not have the Fly service. You can purchase it at kaimux.lt -> Shop" or something similar.