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Card Present

The Finix Card Present SDK enables in-person payment processing with Bluetooth-connected PAX D135 devices. The SDK handles device pairing, transaction processing, refunds, and signature collection.

System Requirements

RequirementValue
Minimum Android VersionAPI 26 (Android 8.0)
SDK Version3.7.0
Supported DevicePAX D135

Environment Designation

Devices must be designated to either Sandbox or Production and cannot switch between them. Use separate devices when testing across both environments.

Quick Start

Initialize the SDK with your credentials, connect to the device, then start a transaction.

val mpos = MPOSFinix(
    context,
    MerchantData(
        merchantId = "MUxxxxxx",
        mid = "",
        deviceId = "DVxxxxx",
        env = Environment.SB,
        userId = "USxxxxxxxxx",
        password = ""
    )
)

mpos.connect(
    deviceName = "PAX_D135_XXXX",
    deviceAddress = "XX:XX:XX:XX:XX:XX",
    callback = object : MPOSConnectionCallback {
        override fun onSuccess() {
            mpos.startTransaction(
                amount = 1000L,
                transactionType = TransactionType.SALE,
                transactionCallback = myCallback
            )
        }
        override fun onError(errorMessage: String) { }
        override fun onProcessing(currentStepMessage: String) { }
    }
)

A complete reference implementation is available in the Finix PAX MPOS Demo App.