Will the cash payment has the app fee and if we refund it, will it return the app fee?
Cash payment can’t have app_fee_money. Only card payments are available or app_fee_money. 
What about the external payment?
Same with external payments. 
Will the cash payment has the app fee and if we refund it, will it return the app fee?
Cash payment can’t have app_fee_money. Only card payments are available or app_fee_money. 
What about the external payment?
Same with external payments. 