Hey there, @lhudgins.
Thanks for following the thread and sharing your concerns with us.
At this time, there's not a warning for the customers when accidentally paying twice. However, I think this would be the perfect opportunity to send feedback to our Product Development Team, so I went ahead and submitted that for you. This way, our developers can review the suggestion and consider it for a future update.
I also wanted to share with you our guide for understanding refunds to customers below.
Please let me know if you have any questions or concerns. Take care!
