Thanks for joining this thread, toostema.

We can only enter one email at the moment to notify customers when they pay online. 

You need to change the current email on file if you need to use a new one. Simply follow the steps provided by my colleague @MaryGraceS in this thread for your guidance.

If you've set up a recurring charge, feel free to read through this article: Turn on or off Customer Notification Emails for Recurring Payments. You'll be able to notify customers when the processed payment has occurred through this link.

Keep me posted if there's anything else you need and Id be glad to help you out.