Thanks for utilizing the Community space, hrshbrmdz.
A variety of factors can contribute to online payment failure. It could be due to a lack of funds or system downtime affecting payment gateways, payment processors, acquiring banks, and issuing banks.
I recommend contacting your financial institution to check why the payment isn't successful. They'll be able to verify the transaction and provide you with information about the failed payment.
I also encourage you to read this article to learn more about the Online Bill Pay feature in QuickBooks Online: What is Online Bill Pay?.
In addition, I've included this resource about voiding payment if a bill is paid by mistake through Online Bill Pay for future reference: Void an Online Bill Pay payment.
You're welcome to post again if you have further questions or other QuickBooks concerns. We're always available to help you.
