It is possible to create a custom report in QuickBooks Online.

> go to Reports

> go to the search box (Find report by name) and enter Check detail 

> click Customize button

> Report period > change per your needs (daily, weekly)

> Columns (choose the columns your bank needs); I needed:

          DATE   ACCOUNT   NUM   AMOUNT  NAME

> Filter

> Transaction Type > select Check and Billpayment (check)

> Cleared > select Uncleared

> Account > select the accounts you write checks from

> Header > Report title > Check Detail - Positive Pay Report

Let me know if that works for you. We should not have to go outside the software for such a critical report!