We're unable to edit the bank account information of your customer when the invoice is in the process. Though, you can void the transaction to avoid the fee.
Just a heads up, you need to do this before the cut-off time, 3:00 PM Pacific Standard Time (PST). If you've already passed it, you would need to get in touch with our Merchant Services Team. They can pull up your account in a secure environment and process the cancellation for you
To Void an invoice paid by credit card or ACH, here's how:
Go to the Sales menu and select the Invoices tab.
Choose the invoice you want to void the payment for.
Click More, then select Void.
Hit Yes, then OK.
In case you want to process a refund, here's how:
From the invoice detail screen, select the payment made link.
Click the date link.
Select the Transaction processed link then choose Refund.
Select Yes, refund my customer.
Hit OK on the Transaction successfully refunded screen.