Randolio Skydiving is a solo skydiving activity, not a group jump system. The current README documents ESX, QB and ND bridges, requires ox_lib, and supports qb/ox target or the linked interact resource. Jump locations and prices belong to the server configuration.
Setup and checks
Test the selected bridge, payment, occupied jump locations and reconnect cleanup. The author states that helicopter and pilot are not networked and that the player jumps automatically after 30 seconds. Preserve those limits in your event design rather than promising synchronized group flights.