Both Checks and Bills can be paid from QuickBooks Online using Checkbook.
How to send a Check from QuickBooks
How to pay a Bill on Checkbook
You can pay many Bills at once using the Bill Pay function under Vendors in QuickBooks. After creating one/multiple Bills, go to Pay Bills, and simply check "Print Later" and "Save and Close" to pay all Bills using digital Checks.
Within 5 minutes, your recipient will get a copy of the digital Check over email to cash.