I'll help you get the invoice back, mflarchitect2000.
You cannot restore a deleted invoice. Instead, we'll need to recreate it manually.
If you have connected your bank account to QBSE, you can categorize the transaction. You can select Add if you haven't recreated the invoice. Otherwise, you can Match it to the existing one. You can also use this link for reference: Create rules to speed up reviews in QuickBooks Self-Employed.
Keep us posted if you have other concerns. Have a great day!