There is only one way I will fly to Bangkok on transit to open the envelope, and the officials took me to the Bank to exchange money and pay it immediately.
The only way I would have flown to transit in Bangkok to open the envelope, and the staff took me to the bank to exchange money and pay it straight away.
There is only one way. I"ll fly to transport in Bangkok to open the envelope and take me to the bank to exchange money for staff and pay there immediately.