We are now using the reader SDK to connect to the card reader for our kiosk payment. But the field “app_fee_money” was not found. The reader SDK does not support “app_fee_money” now?
Unfortunately at this time Reader SDK doesn’t currently support app_fee_money. We’re constantly working to improve our features based on feedback like this, so I’ll be sure to share your request to the API product team. 
@Bryan-Square Any update on if/when the ability to collect “app_fee_money” will be released? It would be incredibly helpful.
Until then, do you have any suggestions on an alternative method to collect fees through a custom POS app that uses Square’s hardware and the Reader SDK? I run a ticket platform, and this service fee is our method of revenue.
Thanks!
At this time we don’t have any updates on app_fee_money with Reader SDK. Unfortunately there isn’t a workaround for collecting a fee for our in person payment solutions other then using Terminal API which supports app_fee_money.