I made invoice for international customer. They paid by wire transfer full amount, but I see In QBO and bank statement amount 20 USD less. How can I clear payment in QBO?

'Tis the season, @kolarova.

You can deduct the $20 less from the payment that you received from your customer to clear it in QuickBooks Online. All you have to do is to add a negative amount upon depositing the payments.

Here's how:

1. Click on the + New button at the left pane.
2. Tick on Bank Deposit.
3. Enter account where the payment will be deposited to.
4. Select the customer's invoice payment.
5. On the Add funds to this deposit section, press on the 1st line and pick the name of the customer.
6. Choose the account where the $20 dollars will be recorded.
7. On the Amount box enter -20. 
8. Hit on Save and Close.

You can do the same process if you encounter the same scenario in the future.

To learn more about receiving payments in QuickBooks Online, please visit this link: Record and make Bank Deposits in QuickBooks Online

If there's anything else that I can help you with, let me know. It'd be my pleasure to assist you. Enjoy the night!

@kolarova 

Consider this payment service to deal with multi-currency customer. It supports QBO.

https://veem.grsm.io/veems

Hope it helps.