Since tourism is closely monitored by Royal Government of Bhutan, the mode of payment transfer to Bhutan is via bank wire only. There are selected international banks which work for the payment transfer to Bhutan. The list of approved bank details will be provided by Heavenly Bhutan. This procedure is same for all the nationals visiting Bhutan.
The entire process is expected to take at least 3-5 working days or even more in some cases but be assured that this is safe, if filled all the details correctly. The process involves minimum of 3 banks to reach the payment in Bhutan which takes time and results in deduction of fees ranging from USD 10-45, per transaction depending on the banks you choose to use and your personal banks.