vendor advises it never received "bill pay" payment. How can I verify this in QBO?

You can effectively verify the Bill payment transaction, Geolen. Let me share some information regarding the processing time for the bill pay payment in QuickBooks Online (QBO).

To start, please note that the processing time for bill payments varies depending on the method used: ACH payments typically take 3 to 5 business days, while Check payments can take 8 to 10 business days. Delivery times may be affected by third-party delays or risk reviews. However, If your payment has exceeded the expected processing time in QBO, I recommend contacting our support team. They can review your account and provide a reliable solution. To reach them, please follow the steps below:

1. Sign in to your QuickBooks Online company.
2. Select the Search tab to enter your question and find Help articles.
3. Enter your concern or ask something
4. Choose Callback, Chat, or Appointment.
5. Enter your information and select Get a chat to get a support expert.

You can also check this article for reference: Get help with QuickBooks products and services.

To learn more about how you can schedule online bill payments in QuickBooks, check out this article: Learn About QuickBooks Bill Pay for QuickBooks Online.

In the future you can enter and manage bills and bill payments in QuickBooks Online. These specific transaction types ensure how you can record everything.

If you have unanswered questions, please don't hesitate to leave a message about Bill pay and you'll be assisted directly.