How do I remove a customer credit?
We do not have a unique way to handle refunds or clear overpayments outside of applying the payment to the outstanding balance of the customer. This is a feature that has been requested on our user feedback forum. If you would like to see this added to WorkingPoint, please vote for the idea: http://workingpoint.uservoice.com/forums/11238-workingpoint/suggestions/305761-allow-for-customer-refunds-to-be-properly-accounte?ref=title
In the meantime, the only way I have seen an overpayment be removed is by reducing the original payment amount by editing the payment that generated the credit or by applying it to an invoice.