Ways to obtain vouchers:
- completing the daily quest called Voucher rush, by harvesting your celestial indurstrial base in your subsidiary territory 24 hours after 8 friends help you repair it
- they are given after server updates/unscheduled outages
- they can be won from the lucky wheel
They are used for:
- additional spins of the lucky wheel
- purchasing items from the web mall
- speeding up module/tech research, ship research, and construction