IDTech iOS/OSX SDK Guide  1.1.052
API reference for BTPay 200
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Add the External Accessory device protocol strings to your projects .pList:

When you are using a device that is accessed on iOS over External Accessory (Bluetooth or Dock Connector), the protocol string must be added to your application .pList under "Supported external accessory protocols" array. BTPay 200 protocol string = "com.idtechproducts.BTPay 200":

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