Customer overpayment

Hi all

I have a customer who has paid 59c more than the invoice. Some of our invoices are integrated from another program (AROFlow) where we send invoices and payments to MYOB. There's no problem with this, just thought I'd give you a little background.

So, the customer overpaid her invoice by 59c but we're unable to alter the invoice amount in AROFlow so it has to be amended in MYOB.  The boss instructed to simple do a journal but I'm unsure how to do this. Would appreciate your assistance :)

Thank you

Trac