Deleted vendor

Check the Audit Log.  

Click on Gear Icon<Tools< Audit Log< All Events<Delete/ Voided Transactions. 

I'll walk you through to find your deleted vendor along with the date, accounting-gooda.

Once you delete a transaction, you cannot restore it. However, using the Audit Log, you can recover the details of the deleted transaction so you can re-enter it.

Here's how: 

1. Go to Settings.
2. Select Audit Log.
3. Click the dropdown menu▼, select the appropriate user, date changed, and event(s).
4. Locate the deleted transaction. (Tip: To easily find deleted transactions, use the browser search Ctrl + F and type "deleted").
5. Under the History column, click on View.

Note:

• Audit Log only works for transactions that were saved. There is no available report for deleted transactions. Consider voiding a transaction instead of deleting or completely removing it from your records.

You can also check out this article to know what's the use of audit log in QuickBooks Online: Use the audit log in QuickBooks Online

If you have any other questions in mind, just click the reply button below and I'd be happy to help you with your concern. Have a nice day! 

Or just leave it as All events, and it will tell you what all has been done and when,