Proof of Quickbook Bill Pay for vendor?

As I know, they will not provide any copies. You will need extra efforts to contact Support to have them cancel the check and reissue a replacement. If you frequently pay vendors by check, I recommend using a third party bill payment solution to sync with QBO.

Let's work on this together, alise1.

In QuickBooks Bill Pay, if your vendor doesn't accept online payments, a physical check will be mailed to them. Additionally, you can create a bill, which allows you to print a check for your expenses.

Here's how to print a check:

1. Go to +New, then click Check.
2. Choose the vendor for your bill as the payee of your bill Payment.
3. Hit Add to select the Bill that you want to pay with this.
4. Tick the Print later box to add the check to the print queue.
5. Go to Print checks and choose an Account.
6. Select the checks you want to print.
7. Click Preview and print.
8. Once done, hit Print.

For future reference, you can check out this article: Set up roles and permissions for paying bills with QuickBooks Bill Pay.

Let us know if you have other concerns, we're always here to lend a hand.

@alise1 

Don't you love it when you pay a vendor, they cash the check, and then they want proof from you that they deposited the check?  I have no affiliation with Bill.com but used it for many years.  They always provide copies of cleared checks so you can send copies to your vendor when they ask.  Just something to consider.