You can make a bank deposit to record the payment you've received from the mobile device. Then, select the Checking account when posting the deposit.
Let me show you how to do it.
Click + New.
Select Bank Deposit.
From the Account ▼ drop-down, choose Checking account.
Go to the Add other funds to this deposit table, add any additional items to include in this deposit.
Make sure the total of the selected transactions matches your deposit slip. Use your deposit slip as a reference.
Select Save and close or Save and new.
QuickBooks has a special way for you to combine transactions so your records match your real-life bank deposit. Here’s how to record bank deposits in QuickBooks Online.
Put transactions you need to combine into your Undeposited Funds account.