Stripe Tap to Pay

[jkennethbalane]

I'm currently implementing Stripe Tap to Pay. Here's the current setup, the application I'm developing is on flutter but since Stripe SDK is only working on kotlin, I needed to create bridge using MethodChannel. It's all okay but here's the scenarios.

On Debug Mode.

1. Mobile is working properly
2. Active Tab 5 is working properly

On Release Mode.

1. Mobile is working properly
2. Active Tab 5 is working but after payment the tap to pay screen is reappearing.

    super.configureFlutterEngine(flutterEngine)
    Log.d("MyFloDebug", "Android Bundle ID of myFlo_Staging: ${androidBundleId}")
    MethodChannel(flutterEngine.dartExecutor.binaryMessenger,"${androidBundleId}/nfc").setMethodCallHandler { call, result ->
      if (call.method == "stripeTapToPay") {
        println("------------------------------------------------- KOTLIN -------------------------------------------------")
        val systemId = call.argument<String>("systemId")!!
        val paymentIntentId = call.argument<String>("paymentIntentId")!!
        val locPermission = call.argument<Boolean>("locPermission")
        val jobId = call.argument<Int>("jobId")!!

        // storing result
        pendingFlutterResult = result
        
        // Location Id
        val locationid = call.argument<String>("locID")
        val liveMode: Boolean = call.argument<Boolean>("liveMode") ?: false
        GlobalStuff2.vGTLocID = locationid
        GlobalStuff2.vGTJobID = jobId

        initializeTerminal(paymentIntentId)
        val terminal = Terminal.getInstance()
        if (terminal.connectedReader != null) {
          Log.d("TerminalCheck", "Connected reader: ${terminal.connectedReader!!.label}")
        } else {
          onDiscoverReaders(liveMode)
        }
      } else {
        result.notImplemented()
      }
    }
  }

  fun initializeTerminal(paymentIntentId: String){
    val logLevel = LogLevel.VERBOSE
    val tokenProvider = TokenProvider();
    val listener = object : TerminalListener {
      override fun onConnectionStatusChange(status: ConnectionStatus) {
        println("[CONNECTION STATUS CHANGE]: $status");
      }

      override fun onPaymentStatusChange(status: PaymentStatus) {
        println("[PAYMENT STATUS CHANGE]: $status");
        if(status == PaymentStatus.READY && !firstTime && !hasStartedTapToPay){
          firstTime = true;
          hasStartedTapToPay = true
          val intent = Intent(this@MainActivity, TapToPayActivity::class.java)
          intent.putExtra("paymentIntentId", paymentIntentId)
          startActivityForResult(intent, 1234)
        }
      }
    }

    if (!Terminal.isInitialized()) {
      Terminal.initTerminal(applicationContext, logLevel, tokenProvider, listener)
    }


    val terminal = Terminal.getInstance()
    println("STATUS IN INITIALIZATION ${terminal.paymentStatus}")
    if(terminal.paymentStatus == PaymentStatus.READY){
      val intent = Intent(this@MainActivity, TapToPayActivity::class.java)
      intent.putExtra("paymentIntentId", paymentIntentId)
      startActivityForResult(intent, 1234)
    }
  }```
  
  on initializtTerminal there's 2 intent call for TapToPay Activity, the reason for it is because on the first payment, the initialization returns PaymentStatus.NOT_READY. so I needed to have a listener wherein if it's ready it will fo to TapToPayActivity. the one outside listener is for handling 2nd payment because after the 1st payment terminal is already at PaymentStatus.READY, the listener will not run since payment status will not change.
  
  Problem.
  1. Invoice 1
  2. Start Payment
  3. Tap to Pay Screen Appears
  4. Tap Card
  5. Payment Successful
  6. Returns to Flutter
  7. Tap to Pay Screen Reappears.
  
  Note. 
  This only happen on Active Tab 5, unsure if other Active Tab have this problem as well.
Android Tab 5 is running on Android Version 16
On TapToPay Activity There's a guard where in if payment Intent is already succeded it will return to main activity with result ok
There's no duplication Payment Intent