In case you issued an invoice for another customer than the one you were supposed to, you can modify that invoice.

You need to go to the Administration part of your account, in the Orders menu. Look for the order for which the invoice was issued, then click on the 3-point button on the right. Choose the View option.

A new window will open, where you can Edit the existing client or add a new client.

If you want to issue a new invoice with the customer data that has been changed, all you have to do is go to the invoicing section below and click Print Invoice.