Hey @JenoP 
I need help in my scenario I hope you can help me.

I have an invoice of $100 and the payment of $104 ($4 charge to customer stripe processing fee) in my software. Now I'm just syncing the Net payment of an invoice. I do not want to add a Line item.
e.x:
I received from user $100 + $4 (stripe processing fee) => in QuickBooks the invoice is $100 and I pushed the payment $100. so I want to sync the $4 correctly.

I'm following the way to record the payment for invoice and Sales Receipt for the "Merchant Fee charged to Client (other income A/c).

Does any other way so I can follow the approach? For tips Sync I'm syncing the Tip to Undistributed Tips account by credit the Undistributed Tips & debit the Undeposited Funds.

I just want to record the processing fee for the Report without affecting user invoice & customer balance.