question

I recommend using Payment Connector - it abstracts away the complexities and details of firing raw intents. If our example app is working correctly for you can you take a closer look at the differences between that and your app?

@David Marginian - Yes we are trying to debug it but at this stage, we are at a dead end. We would prefer using Payment Connector. However, as described above, its not reliably launching. Our app is fairly simple. The main difference between the Clover example and our app launches 2 Activities then last activity calls the PaymentConnector.sale(). In the Clover example, most PaymentConnector operations are in a Fragment. As such I don't think there should be a dependency,but that difference is something we are not able to resolve.

During debug we observed the following:
inside the .sale() function, it checks if its connected. If its not connected, it creates async task to connect then call underlying service.sale().

The Clover Payment Screen launches all the time if it goes into the async task way. We have not seen it launch if it is already connected (in sale, paymentV3Connector.isConnected()).
The difference will in these two paths will be the state (Paused/ Running etc) of last Activity. Is there any assumption about the state of the previous Activity?

  public void sale(final SaleRequest request) {
    try {
      if (request != null) {
        request.setVersion(2); // this version supports validation
      }
      if (paymentV3Connector != null) {
        if (paymentV3Connector.isConnected()) {
          paymentV3Connector.getService().sale(request);  //***** Does not launch ****
        } else {
          this.paymentV3Connector.connect();
          waitingTask = new AsyncTask() {
            @Override
            protected Object doInBackground(Object[] params) {
              try {
                paymentV3Connector.getService().sale(request); //***** Does launch ****
              } catch (RemoteException e) {
                Log.e(this.getClass().getSimpleName(), " sale", e);
              }
              return null;
            }

D/InputTransport(12285): Input channel constructed: name='424ab660 com.clover.example/com.clover.example.CloverPaymentActivity (client)', fd=60
I/Choreographer(12285): Skipped 181 frames!  The application may be doing too much work on its main thread.
D/        (12285): onServiceConnected com.clover.connector.sdk.v3.PaymentV3Connector@422e7c60
D/        (12285): appTracking = {"developerAppId":null,"applicationVersion":"1.0","sourceSDKVersion":"1.4.0","sourceSDK":"com.clover.connector.sdk.v3.PaymentConnector","applicationID":"com.clover.example"}