Good evening, @LDunlap1. 

Thanks for following the thread and sharing your concerns. 

I understand the importance of this feature request, however, at this time, there isn't an option to provide your customer a credit memo number to apply to their invoices. In this case, you'd need to manually create single credit memos and apply them to individual invoices. You can learn more about the credit memo process in Applying a credit memo. 

In the meantime, I've submitted a feedback request on your behalf to our Product Development Team, so this can be considered in a future update. 

You can follow all of our latest happenings and updates by using our Blog Site. 

Please let me know if there is anything else that I can do for you. I'm happy to lend a hand anytime. Take care and have a wonderful rest of your day!