I am developing a POS registry application in Japan. I am using SquareAPI in the process. I would like to test SquareTerminal actual device and actual credit card and FELICA payment in order to test the payment API of the terminal.
Is there any way to use actual equipment or actual cards in a Sandbox environment?
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With Square’s sandbox the ability to test on the actual device like the Terminal isn’t currently available. You’ll need to use the Terminal API supported collection of special device_id values to simulate terminal checkouts without connecting to a physical Square Terminal. 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. 
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