Payment Terms

This purely relates to settlement of payments for the goods.

TT means buyer will pay for the goods in advance.

L/C sight means buyer will pay when the all original documents arrive at his bank including the title documents.

The third scenario is buyer will pay 30% in advance before shipment and 70% when the original documents arrive at his bank.

D/A basis.. D/A is guaranteed by the buyer himself. It means if the buyer goes bankrupt, nobody will pay you. So you can consider this payment method when you are sure the buyer is financially no problem. But if you are not familiar with him, it's better use L/C that can be guaranteed by the bank. Normally a bank is not so easy to go bankrupt.