Every transport provider on Shiply is different and will have individual payment terms and methods.
Before accepting a quote on Shiply, you should visit their profile page, which you can do by clicking on their username. Among the other useful information such as feedback score, feedback comments and business background text, there is the company snapshot (on the right). Under this section, the transport provider stipulates their payment terms and methods.
Generally payment terms differ between part-payment up front, full-payment up front or payment on delivery.
Please be sure to check this information prior to accepting a quote.