record a transaction that refunds 2 separate customers

I'd be happy to guide you on how to record a credit card refund transaction to your customers, @laurrat.

If those refunds are for a sales receipt, paid invoice, or receive payment form, here's what you'll need to do:

1. On your QuickBooks Online account, go to the Sales menu on the left.
2. Choose the All Sales tab. 
3. Locate and select the sales receipt, invoice, or payment.
4. In the footer, click More, then Refund.
5. Once a refund receipt opens, verify the information if it looks correct.
6. Select Save and close.

For additional details about this process, see this article: Void or refund customer payments in QuickBooks Online.

In addition, if you have downloaded banking transactions, you can match them in the For Review tab to the existing entries in QBO. Please see this article for more details: Add and Match Transactions. 

However, if you mean something else, let me know and provide further details. I'm always glad to help in any way I can. Have a great rest of the day.

Customer refund if invoice has been paid
Select + New and select Credit memo.
In the Customer field, select the appropriate customer.
Enter the Credit Memo Date, Amount, Tax, and Product/Service (This is the category, product, or service you’re getting a credit for).
Select Save and close.
Note: If the customer has overpaid – you do not need the credit memo as you will already have an unapplied credit that acts as your credit memo.

Select + New and select Expense.
In the Payee field, select or enter the desired customer.
In the Payment account field, select the bank the money is being refunded from.
In the Category field, select the Debtors account (Accounts receivable).
In the Amount field, enter the amount of the refund.
In the Tax field, select the appropriate Tax (not inclusive/exclusive of tax).
Select Save.
Next, go to + New and select Receive payment.
Add the Customer and choose the Payment method and Deposit to.
Balance should be 0 as they will cancel each other out.
Select Save and close.
If you have Online Banking, go to Bookkeeping then Transactions then select Bank transactions (Take me there), or go to Banking (Take me there). Then match the record you found. alaskasworld.com