Good day. I'd be glad to help with your concern when trying to pay a vendor bill in QuickBooks Online (QBO).
In this case, the prompts you encountered is working as designed, so if you have a payroll account there will be a contractor window but if not, there's a vendor window. Also, only bills are eligible for the online bill payment option. You can use this option to pay your contractor if you've prepared a bill for them. Additionally, once you enable the bill payment option for your vendors' payments, no check will be generated. I advise producing a check from the contractor's page in order to pay your contractor. Additionally, their invoices may be connected to this transaction.
Furthermore, if you want to pay vendor using Online Bill pay, you can refer to this article for a detailed steps: Pay a vendor. I've also added the following article for more details about managing bills in Online bill pay and in QuickBooks Online:
Moreover, if you want to disable the online bill pay option for this contractor, you'll need to reach out to your service provider so they can do it for you.
Feel free to reach back at us if you need more help managing your vendor bills in QuickBooks Online. I'll be around. Stay safe!
