A company that is a leading provider of training delivers courses to students globally. The company decided to use Customer Community in order to allow students to log in to the community, register for courses and pay course fees. The company has a payment gateway that takes more than 30 seconds to process the payment transaction. Students would like to get the payment result in real time so in case an error happens, the students can retry the payment process. What is the recommended integration approach to process payments based on this requirement?