Procesar una transacción de compra

val paymentResultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
    val data = result.data

    if (result.resultCode == Activity.RESULT_OK && data != null) {
        // The transaction process completed and generated a receipt.
        val status = data.getStringExtra("status") ?: "None"

        if (status == "APPROVED") {
            println("Payment approved successfully!")
            // Extract receipt data and display success to the merchant
        } else {
            val declineCause = data.getStringExtra("declineCause") ?: "Unknown"
            println("Payment declined: $declineCause")
            // Display decline reason to the merchant
        }
    } else if (result.resultCode == Activity.RESULT_CANCELED) {
        // The user canceled the payment, or a pre-transaction error occurred.
        val errorCode = data?.getStringExtra("errorCode") ?: "None"
        val errorMessage = data?.getStringExtra("errorMessage") ?: "User Canceled"
        println("Payment canceled or failed: $errorMessage ($errorCode)")
    }
}

val transactionIdReceiver = object : BroadcastReceiver() {
    override fun onReceive(context: Context?, intent: Intent?) {
        val transactionId = intent?.getStringExtra("sdkTransactionId")
        println("Transaction started with ID: $transactionId")
        // Save this ID temporarily in case you need to recover the transaction
    }
}

// Register the receiver
ContextCompat.registerReceiver(
    requireActivity(), // or 'this' if in an Activity
    transactionIdReceiver,
    IntentFilter("com.dejamobile.cbp.sps.TRANSACTION_BROADCAST_RESPONSE"),
    ContextCompat.RECEIVER_EXPORTED
)

private fun performPurchase(amountInCents: Long, tipInCents: Long? = null) {
    // 1. Calculate the final total amount
    var finalAmount = amountInCents
    if (tipInCents != null) {
        finalAmount += tipInCents
    }

    // 2. Build the intent
    val intent = Intent().apply {
        setClassName(
            "com.dejamobile.cbp.sps.app",
            "com.dejamobile.cbp.sps.app.POSActivity"
        )

        // Session Identifiers
        putExtra("userId", userId)
        putExtra("userToken", userToken)
        putExtra("merchantId", merchantId)

        // Transaction Details
        putExtra("transactionType", "PURCHASE")
        putExtra("amount", finalAmount)
        if (tipInCents != null) {
            putExtra("tip", tipInCents)
        }

        // Optional Configuration
        putExtra("paymentMode", "Card") // Default is "Card". "Link" is also supported.
        putExtra("externalTransactionReference", "ORDER-12345") // Link this payment to your internal order ID
        putExtra("locale", "en_US") // Force a specific language on the payment screen
        putExtra("transitionAuto", true) // Automatically transition back to your app after completion
    }

    // 3. Launch the intent
    paymentResultLauncher.launch(intent)
}