Micropayments

A micropayment is a financial transaction involving a very small sum of money and usually one that occurs online. A number of micropayment systems were proposed and developed in the mid-to-late 1990s, all of which were ultimately unsuccessful. A second generation of micropayment systems emerged in the 2010s.

(source: en.wikipedia.org)

What is PayPal MicroPayment and How Does it Work?