Hello there, @greg-activedoors.
Welcome to the QuickBooks family. Let me share some clarification about the deleted invoice in QuickBooks Online.
Currently, an option or ability to restore deleted transactions is unavailable. However, you can use the Audit log feature to recover the details and recreate the invoice manually.
After taking note of the details, you can now proceed with creating the transaction. In case you need the detailed steps, please visit the Create invoices in QuickBooks Online article.
Additionally, here are some helpful references that you can check out regarding the audit log, as well as recording invoice payments:
Feel free to drop a comment below if you have any other questions. I'll be more than happy to help. Wishing you a good one.