The Black KCPpay X990 App version 1.0.0.4
hello. This is KCP POS pro. 
We are pleased to inform you that we have updated the function of The Black terminal (The Black KCPpay X990 app 1.0.0.4 version ).
[Main update contents]
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Barcode OTC payment (standalone payment, app-to-app payment)
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Support for UnionPay dual brand, accept credit payment UnionPay
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Other internal improvements
