thanks @AhmedAtia, nice of you to respond and offer some advice. What i ended up trying was creating a liability account called ‘Bandcamp accrued fees’, and an expense account ‘Bandcamp fees’. When we are owing fees im noting it via a journal entry in the liability account, so we have a running total.
when we make a digital sale but receive no funds because of owed fees, im noting that in the sales receipt as a debit against the liability account. the sales receipt needs to equal zero. I ended up finding this thread that i used for a guide when i searched for accrued expenses - Overtime (Salary) & Accrued Expenses
i have to admit im finding this forum challenging to work out what is considered an accounting question and what is a Manager question. That link is a good example.