A customer has accounts payable and invoices paid on behalf of the book, how to offset?

I'm here to guide you through offsetting your customer's account payable and invoices in QuickBooks Online (QBO), young.

To start with, we can create a barter account and direct the transactions there. Create an invoice after that and input a bill to document the services rendered by the customer.

Here's how to add the account:

1. Head to the Accounting menu from the left navigation pane and choose Chart of Accounts.
2. Select + New button to create a new account.
3. Choose Bank under the Account dropdown, and Press the Cash on hand under the Detail Type dropdown.
4. Type barter or a name that will identify the account in the Account Name field.
5. Press the Save & Close menu.

Once done, since you already created the invoice, you can receive its payment and deposit this to the Barter account you created. Here's how you can enter the payment:

1. Tap the + New icon and select Receive payments under Customers.
2. Choose the barter customer.
3. Choose a Payment method and pick the barter account under the Deposit to dropdown.
4. Fill in the fields with the correct information. 
5. Select Save and close. 

To enter a bill for a barter transaction:

1. Tap the + New icon again and select Bill under Vendors. Then, fill in the fields with the correct information.
2. Click Save.

Here's how to pay the entry:

1. Navigate to Vendors from the + New icon and tap Pay Bills.
2. Choose the bill you want to pay.
3. From the Payment account dropdown menu, pick the barter bank account.
4. Click Save.

Additionally, you can refer to this article for more details about the process: Record a barter transaction.

Comment below for any other queries regarding keeping track of supplier or customer transactions. I'm prepared to answer them at any time. Have a great day!