Do I have to print out anything?
It depends on the operator, but yes, you need to print the voucher in most cases.
We are recommending to print the voucher even if the operator accepts the screenshot. The first page of the voucher contains a map, the address in the Thai language for your taxi driver and the contact number for your booking, which could help you at the emergency situation.
In case you are traveling by the Thai railways, there is no needs to print out the voucher.
You can show a screenshot or tell us your booking number when you pick up the tickets in our office or in Bossotel in Chiang Mai.
SeaTran Discovery Ferry requires a printout of the voucher only on few stations at the Western part of the country. Their main counters accept screenshots as well.