Thanks for posting, @JRGZC.
I'll share some information about the vendor ID number. To verify, are you referring to the vendor's Business ID No.? If so, you can find them from the vendor settings. Let me walk you through how.
- Go to Expenses.
- Choose Vendors.
- Select the vendor's profile and then tap Edit.
- Scroll towards the Business ID No./ Social Security No. section. See the image below.
- Click Save when you're done.

Here's a short video clip for details about vendors: How to Manage Your Vendors List.
Let me know if you're talking about something else, I'll be on the lookout for your reply. Take care and have a nice day ahead.