QuickBooks Online (QBO) helps you in recording and tracking all your business transactions. In line with this, your Business Debit card transactions should be included in your account to effectively monitor its income and expenses.
You can start by adding your Business Debit card account into your QBO account. You can create one through your Chart of Accounts. Let me guide you how.
Go to the Gear icon.
Select Chart of Accounts.
In the AccountType drop-down menu, choose an account type.
In the Detail Type drop-down, select the detail type.
Enter your debit card name in the Name field.
Input all needed information.
Click Save and Close.
I've attached screenshots below for your reference.