Cash, this payment method can be problematic as your staff may lose it after the payment has been handed over. If you want this payment method we recommend that you indicate who it must be received by i.e. Administration Manager etc otherwise it is quite broad and risky for Thai-Amadeus.
Cashier's cheque is a safer payment method than cash, however this method is subject to certain drawbacks including bank fees and the fact that cheque processing can be slow.