Hello, Is app_fee_money for in person hardware payments available in AU?
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Yes, it is available with Mobile Payments SDK for in person payments. 
Yes, the app_fee_money field is available for in-person hardware payments in Australia. You can use the Mobile Payments SDK or Terminal API to collect application fees from in-person payments. However, to collect application fees, you need to have a Square account in the seller’s country, and both the seller’s Square account and your international Square accounts must be approved for credit card processing.
This answer was reviewed by @Bryan-Square.