Best way to enter Afterpay/ZipPay merchant fees already taken from income paid

Hi, looking for some guidance on the best & easiest way to record the Afterpay/zip pay merchant fee which is already taken once we are paid.

we have been receiving payments from them for a couple years now and I've never entered the fees but gathered it would be beneficial for us to claim the merchant fees as there is a large amount each month.
As we have bank feeds setup I simply allocate the amount paid to us as income because the merchant fees are already taken once paid to us. 

I don't get to see the merchant fees til the end of month so how would I enter this? I did think about just creating a "spend money" transaction but then that amount would be sitting there as a payment made from the business account when it hasn't so I won't be able to reconcile it, I can't really either go to each Afterpay payment on our bank feed and manually add the merchant fee because that would be a massive task.

Would really appreciate some help please people. Thanks!