How to receive the message that the payment product has not been paid?

This may be that the payment you placed in an APP has not been completed and is in a state of pending payment. If you bought something recently, you can check the order details to see if there is any payment, so as to prevent the delay in delivery and use time due to non-payment.

Online payment refers to the transfer of funds through the Internet, where financial buyers and sellers use financial instruments supported by bank numbers to conduct transactions, and online monetary payment, cash flow, fund settlement, inquiry and statistics between businesses from buyers to financial institutions, thus providing financial support for e-commerce services and other services.

In the relevant game theory literature: payment refers to a strategy to induce costs and benefits.