Hello there, erbrel.

I'm here to more information why there's Melio transactions on your QuickBooks Online account.

You may have signed up BillPay in QuickBooks. Since Melio is the back-end provider behind BillPay in QuickBooks, once you've signed up for our service, you've already given consent to give Melio access to your account. 

I've added this link as your guide in paying bills: What is Online Bill Pay?

Keep us posted if you have other concerns. We're always here to help.