Dear Suphitsara,
As the PO for trial, please make the payment to be 100% TT ADV as the PO you've sent.
I'll make the price to be CIF usd 1850/t.
Attached is the PI for this trial order. If the PI is OK, I'll send you the contract.
Could we talk more on skype or Whats App? My skype: innawang@outlook.com.
Looking forward for your reply. Thanks a lot for your support!