I can help you with the whole process. Let's log in to your QuickBooks Payments account to cancel the invoice payments of your customers.
For more details about the method, visit this article: Void or refund transactions in QuickBooks Payments.
You can always open a customer's report in your account to review all the transactions you've created. Simply go to the Reports tab, then customize it to show the specific details. For more information about this matter, check out this article: Customize reports in QuickBooks Online.
I've also added articles about handling your customer's payments, reports, and other related topics.
Please leave a comment below if you have other questions. I'm glad to help. Keep safe!