Non-SDK based Integration

Check current Paytm app version
privateString getPaytmVersion(Context context) {
    PackageManager pm = context.getPackageManager();
    try{
      PackageInfo pkgInfo = pm.getPackageInfo(PAYTM_APP_PACKAGE, PackageManager.GET_ACTIVITIES);
      returnpkgInfo.versionName;
    }catch (PackageManager.NameNotFoundException e) {
           PaytmUtility.debugLog("Paytm app not installed");
    } 
    return null;
}
Compares two version strings.
<p>
Use this instead of String.compareTo() for a non-lexicographical

comparison that works for versiorn strings. e.g. "1.10".compareTo("1.6")
 @param str1 a string of ordinal numbers separated by decimal points.

@param str2 a string of ordinal numbers separated by decimal points
@return The result is a negative integer if str1 is _numerically_ less than str2.

The result is a positive integer if str1 is _numerically_ greater than str2.

The result is zero if the strings are _numerically_ equal.

 @note It does not work if "1.10" is supposed to be equal to "1.10.0".
private int versionCompare(String str1, String str2) {
if (TextUtils.isEmpty(str1) || TextUtils.isEmpty(str2)) {
       return 1;
   }
   String[] vals1 = str1.split("\\.");
   String[] vals2 = str2.split("\\.");
   int i = 0;
   set index to first non-equal ordinal or length of shortest version string
   while (i < vals1.length && i < vals2.length && vals1[i].equalsIgnoreCase(vals2[i])) {
       i++;
   }
   compare first non-equal ordinal number
   if (i < vals1.length && i < vals2.length) {
       int diff = Integer.valueOf(vals1[i]).compareTo(Integer.valueOf(vals2[i]));
       return Integer.signum(diff);
   }
   the strings are equal or one string is a substring of the other
   e.g. "1.2.3" = "1.2.3" or "1.2.3" < "1.2.3.4"
   return Integer.signum(vals1.length - vals2.length);
}
if (versionCompare(currentAppVersion, "8.6.0") < 0) {
Full screen App Invoke flow
}else{
New App Invoke flow
}

1.  If the app version is less than 8.6.0, then use the code below:

   try{
       Intent paytmIntent = new Intent();
       Bundle bundle = new Bundle();gues
       bundle.putDouble("nativeSdkForMerchantAmount", Amount);
       bundle.putString("orderid", OrderID);
       bundle.putString("txnToken", txnToken);
       bundle.putString("mid", MID);
       paytmIntent.setComponent(new ComponentName("net.one97.paytm", "net.one97.paytm.AJRJarvisSplash"));
       paytmIntent.putExtra("paymentmode", 2); // You must have to pass hard coded 2 here, Else your transaction would not proceed. 
       paytmIntent.putExtra("bill", bundle); 
       startActivityForResult(paytmIntent, ActivityRequestCode);
      }
       catch(Exception e){
         //This can handle ActivityNotFoundException or any other exception if any.
         //Handle this exception as the same in case of Paytm App doesn’t exist.
      }

2. If the app version is 8.6.0 or greater, then use the code below for new App Invoke flow integration:

   try{
       Intent paytmIntent = new Intent();
       paytmIntent.setComponent(new ComponentName("net.one97.paytm", "net.one97.paytm.AJRRechargePaymentActivity"))
       paytmIntent.putExtra("paymentmode", 2);
       paytmIntent.putExtra("enable_paytm_invoke", true);
       paytmIntent.putExtra("paytm_invoke", true);
       paytmIntent.putExtra("price", Amount); //this is string amount
       paytmIntent.putExtra("nativeSdkEnabled", true);
       paytmIntent.putExtra("orderid", OrderID);
       paytmIntent.putExtra("txnToken", txnToken);
       paytmIntent.putExtra("mid", MID);
       context.startActivityForResult(paytmIntent, requestCode);
      }
       catch(Exception e){
         //This can handle ActivityNotFoundException or any other exception if any.
         //Handle this exception as the same in case of Paytm App doesn’t exist.
      }

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == ActivityRequestCode && data != null) {
    Toast.makeText(this, data.getStringExtra("nativeSdkForMerchantMessage") + data.getStringExtra("response"), Toast.LENGTH_SHORT).show();
    }
}

("paytm://merchantpayment?txnToken=(txnToken)&orderId=(orderId)&mid=(mid)&amount=(amount)")

func invokePaytmApp(txnToken: String, orderId: String, mid: String, amount : String) -> Bool {
    if let paytmInvokeURL:URL = URL(string: "paytm://merchantpayment?txnToken=(txnToken)&orderId=(orderId)&mid=(mid)&amount=(amount)") {
        let application:UIApplication = UIApplication.shared
        if (application.canOpenURL(paytmInvokeURL)) {
            application.open(paytmInvokeURL, options: [:]) { (finish) in}
            return true
        }
        else{
            //Paytm app Redirect the user to Paytm HTML payment page
            return false
        }
    }
    return false
}

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
    let dict = separateDeeplinkParamsIn(url: url.absoluteString, byRemovingParams: nil)
    //get paytm params from dictionary 
    return true
}