Having experienced my first 'issue of credit' in the Webflow system I've spoken with the support staff and they suggested that I post this as a wishlist item.
As a business, the client of Webflow, we will often need to handle 'credit' when things go wrong, when plans change etc. and so I'm suggesting that we follow the standard approach of receiving actual Credit Notes so that we can easily see what credit has been issued against what project / site and in what situation (the Why). See here for a good, brief explanation of why this can be useful between the two parties: