Hi Gertron,
Thanks for reaching out here. Welcome! At this time, there isn't a report that would include the Pay Now links for customer invoices in QuickBooks Online. If you feel this would be beneficial, I recommend submitting a suggestion to our Development Team for future updates. Suggestions are greatly appreciated to assist with the best overall customer experience with QuickBooks Online.
If you have other questions, feel free to reach back out. We'd be happy to help!