I have put a payment to the wrong client and when trying to fix it have now doubled the credited amount?

Hi user47363,

Thanks for posting in the Community! You can remove the duplicate payment by following these steps:

1. Click on the Sales tab, then click on Customers
2. Select the customer's name and locate the payment in the Transaction List. 
3. You can Filter by money received if required
4. Click on the payment to expand the details. At the bottom of the page, select More, then Delete
5. This removes the duplicate payment.

If the payment was downloaded from the banking feeds, you can undo or unmatch the transaction and the match them to the correct payment.

Also, you can check out this article about categorizing and matching online bank transactions in QBO. It has detailed steps that'll guide you through the process.

Feel free to reply to this thread if you need more help with QuickBooks Online. The Community is here to help you. Have a nice day!