Hi there, 

The easiest way I find to record Cash App payments is to split the transaction under the Banking Transactions For Review - with the client and then the expense.   For example, if I invoiced a client at $ 150.00 - I would receive $ 145.25.  You would make a CashApp vendor in the Expenses Section.   When selecting the transaction under Banking - I split the transaction between the client at a $ 150 and then Vendor Expense -4.75.  

I hope this helps.