{
  "link": "https://billpay-qa.setu.co/1238993883748223",
  "sessionId": "1238993883748223",
  "success": true,
  "traceId": "GHSUU99128DBVU"
}

public class DisplayWebView extends AppCompatActivity {
    WebView myWebView;
    public static final String LINK = "com.example.axispayemulator.LINK";
    private class MyWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (Uri.parse(url).getHost().contains(".setu.co")) {
                return false;
            }
            // Otherwise, the link is not for a page on my site, so launch another Activity that handles URLs
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            startActivity(intent);
            return true;
        }
    }
    @Override
    public void onBackPressed(){
        if(myWebView.canGoBack()){
            myWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // Check if the key event was the Back button and if there's history
        if ((keyCode == KeyEvent.KEYCODE_BACK) && myWebView.canGoBack()) {
            myWebView.goBack();
            return true;
        }
        // If it wasn't the Back key or there's no web page history, bubble up to the default
        // system behavior (probably exit the activity)
        return super.onKeyDown(keyCode, event);
    }
    @SuppressLint({"SetJavaScriptEnabled", "AddJavascriptInterface"})
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_display_web_view);
        Intent intent = getIntent();
        myWebView = findViewById(R.id.pswebview);
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        MyWebViewClient client = new MyWebViewClient();
        myWebView.setWebViewClient(client);
        myWebView.setWebChromeClient(new WebChromeClient());
        // Please make sure to keep the interface name Android
        myWebView.addJavascriptInterface(new WebAppInterface(this), "Android");
        String link = intent.getStringExtra(DisplayWebView.LINK);
        myWebView.loadUrl(link);
        myWebView.setDownloadListener(new DownloadListener() {
            public void onDownloadStart(String url, String userAgent,
                                        String contentDisposition, String mimetype,
                                        long contentLength) {
                Intent i = new Intent(Intent.ACTION_VIEW);
                i.setData(Uri.parse(url));
                startActivity(i);
            }
        });
    }
}

public class WebAppInterface extends AppCompatActivity {
    Context mContext;
    /** Instantiate the interface and set the context */
    WebAppInterface(Context c) {
        mContext = c;
    }
    /** Show a toast from the web page */
    @JavascriptInterface
    public void initiatePayment(String orderId, String beneVpa, String amount, String callback, String remarks, String mobileNumber, String refId, String customerId, String allowedPaymentModes) {
        Intent intent = new Intent(mContext, PaymentScreen.class);
        intent.putExtra("BENE_VPA", beneVpa);
        intent.putExtra("ORDER_ID", orderId);
        intent.putExtra("AMOUNT", amount);
        intent.putExtra("CALLBACK_URL", success_url);
        intent.putExtra("REMARKS", remarks);
        intent.putExtra("MOBILE_NUMBER", remarks);
        intent.putExtra("REF_ID", refId);
        intent.putExtra("CUSTOMER_ID", customerId);
        intent.putExtra("ALLOWED_PAYMENT_MODES", allowedPaymentModes)
        mContext.startActivity(intent);
    }
    /** Show a toast from the web page */
    @JavascriptInterface
    public void unload() {
        Intent intent = new Intent(mContext, MainActivity.class);
        mContext.startActivity(intent);
    }
}