1.

Different meanings: The function of currency as a medium of exchange for goods is called the function of currency as a means of circulation; currency is used to pay off debts or pay taxes, rents, wages, etc., that is Functions of monetary means of payment.

2.

The background of the emergence is different: the means of circulation emerged after the emergence of currency, and currency became the medium of commodity exchange; the means of payment emerged with the emergence of credit transactions , in credit sales and purchases, money is used to pay debts.

3.

The objects they purchase are different: currency as a means of circulation mainly purchases physical goods; currency as a means of payment mainly purchases services.

4.

The time and space for the delivery of the two currencies are different: as a means of circulation, currency is generally delivered once when purchasing goods, that is, "paying money with one hand, "One-hand delivery." Currency as a means of payment can be delivered in installments and can be separated in time and space when purchasing goods or services. Either pay first and then serve; or serve first and then pay.