Waiting list - Request payment button

2. You can go to Events Booking -> Registrants, filter registrants by waiting list status. Then select the individual waiting list you want to become registrant (to replace the cancelled registrant), press Request payment button in the toolbar. When you do that, a request payment email will be sent to that registrant to allow him to click on to make payment and become registrants in the system. Make sure you go to Events Booking -> Emails & Messages, look at Waiting List Messages tab, change Payment request email subject and Request payment email body messages to meet your own need before requesting