Hi there, @steve136.
When the vendor receives the payment, they will get an email confirmation and an update on their bank statement regarding the deposit.
On the email confirmation, the vendor will see the invoice number and the amount paid.
You can view some example of email notification and bank statement on this link for your reference: https://support.bill.com/hc/en-us/articles/203691909.
If you have any other related concerns about payments, you can post your question here. Have a good one.