International Trade has been in existence for thousands of years. Trade Finance developed as a means of growing it further. The widespread use of trade finance is one of the factors that have contributed to the enormous growth of international trade with the likes of China in the recent decades.
In its simplest form, Trade finance works by Finport paying for the goods which the Australian Importer requires for selling within Australia, but they don't have the available funds to pay for the deposit or order at the current time. Once the goods have been shipped and received in Australia, the Australian Importer will repay Finport on the initial terms agreed.