MainActivity.java

    @Override
    public void onTransactionCompleted(TransactionDetails transactionDetails) {
        // Transaction Completed
        Log.d("TransactionDetails", transactionDetails.toString());
    }

    @Override
    public void onTransactionSuccess() {
        // Payment Success
        Toast.makeText(this, "Success", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onTransactionSubmitted() {
        // Payment Pending
        Toast.makeText(this, "Pending | Submitted", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onTransactionFailed() {
        // Payment Failed
        Toast.makeText(this, "Failed", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onTransactionCancelled() {
        // Payment Cancelled by User
        Toast.makeText(this, "Cancelled", Toast.LENGTH_SHORT).show();
    }