It's my pleasure to help you handle and categorize refunds in QuickBooks Online (QBO), @Manyzz.

The first thing we need to do is to record a refund in your QBO account. Then, we can match it to your bank transactions.

To enter a refund, here's what we need to do:

1. Click + New and choose Credit card credit.
2. In the Payee field, select the appropriate supplier.
3. From the Bank/Credit account ▼ dropdown, select the credit card to which you received the refund.
4. Enter the Payment date, refund Amount, Tax, and Category.
5. Note: The category used here is the original expense account on the original bill.
6. Lastly, choose Save and close.

Once done, let's categorize this in your banking section. For detailed steps, please see this article: Categorize and match online bank transactions in QuickBooks Online.

I'm also adding this link to help reconcile your accounts so they always match your bank and credit card statements.

Fill me in if you have further questions about categorizing a refund in QuickBooks. I'll be happy to help you again. Stay safe!