A payment processing KPI is an industry-standard metric that evaluates the performance of a payment gateway. It measures how quickly and reliably the system processes payments, allowing businesses to compare the success of different options and make informed decisions. KPI stands for Key Performance Indicator, and it gives businesses insight into how their payment processing systems are performing. A good KPI should account for factors like transaction speed, customer satisfaction, transaction volume, and fraud rates. With this data, business owners can start making improvements that will lead to increased efficiency and better customer experiences.