Mastering RazorPay Payment Gateway in Flutter

Razorpay In Flutter

Mastering Razorpay

 

Razor Pay is one of the best payment gateways in flutter apps up till now. Going digital everywhere now digital payments are present for almost every product and service. Having Payments facility in apps now is not just only a fashion now it's the convenient fashion it's the demand of the current era. There exist many other payments too in flutter but we would be using Razorpay in today's blog, as it also has the most updated plugin in pub.dev. So let's start and implement it in around 15 min. Let's master the Razorpay in Flutter.

How Our App Will Show Up?

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Generate API Key:

1. Sign in to your Dashboard using the credentials.

2. Choose the mode (Test or Live) for which you want to create the API key. Here, we are using the test mode API key.

3. Go to Settings → API Keys → Generate Key to create a key for the chose mode.

Step1: Add the Dependencies

Add dependencies to pubspec.yaml file.

dependencies:

razorpay_flutter: ^1.2.3

Run flutter packages get in the root directory of your app.

Add Proguard Rules (Android Only)

-keepattributes *Annotation*
-dontwarn com.razorpay.**
-keep class com.razorpay.** {*;}
-optimizations !method/inlining/
-keepclasseswithmembers class * {
  public void onPayment*(...);
}

Add the following lines to the Proguard files, if you are using Proguard for your builds.

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Step2: Import

import 'package:razorpay_flutter/razorpay_flutter.dart';

Minimum Version Requirement:

• For Android, the minimum API level for your app should be 19 or higher.

• For iOS, the minimum deployment target for your app should be iOS 10.0 or higher. Also, don't forget to enable bitcode for your project.

Step3: Razorpay Instance :

razorpay = new Razorpay();

Event Listeners :

The plugin exercises event-based communication. It emits events once payments fail or succeed.

The following constants expose the event name: EVENT_PAYMENT_SUCCESS, EVENT_PAYMENT_ERROR and EVENT_EXTERNAL_WALLET from the Razorpay class.

To attach event listeners, use the on(String event, Function handler) method on the Razorpay instance.

razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, handlerPaymentSuccess);
razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, handlerErrorFailure);
razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, handlerExternalWallet);

Handlers : 

void handlerPaymentSuccess(PaymentSuccessResponse response) {
  print("Pament success");
  msg = "SUCCESS: " + response.paymentId;
  showToast(msg);
}

void handlerErrorFailure(PaymentFailureResponse response) {
  msg = "ERROR: " + response.code.toString() + " - " + jsonDecode(response.message)['error']['description'];
  showToast(msg);
}

void handlerExternalWallet(ExternalWalletResponse response) {
  msg = "EXTERNAL_WALLET: " + response.walletName;
  showToast(msg);
}

Clear Event Listeners :

razorpay.clear();

Step4: Checkout Options :

var options = {
  "key": "Use Your API Key Id here",
  "amount": num.parse(textEditingController.text) * 100, // Convert Paisa to Rupees
  "name": "Test Payment By Kamlesh",
  "description": "This is a Test Payment",
  "timeout": "180",
  "theme.color": "#03be03",
  "currency": "INR",
  "prefill": {"contact": "2323232323", "email": "[email protected]"},
  "external": {
    "wallets": ["paytm"]
  }
};

All the other checkout Form Fields can be used for more customization/requirements.  All Checkout Form Fields.

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Step4: Open Razorpay Checkout :

razorpay.open(options);

 

Now You Can Store fields in the server from the success response. 

****** Responses ******

Payment Success Response :

• Payment Id:  string The ID for the payment.
• Order Id:  string The order ID for payment of an order, else null.
• Signature: string  The signature to be used for verifying the payment. Only valid for orders, otherwise null.

Payment Failure Response :

• Code: integer The error code.
• Message: string The error message.

External Wallet Response :

Wallet Name: string The name of the external wallet selected.

****** Error Codes ******

The error codes have been uncovered as integers by the Razorpay class.

The code field of the PaymentFailureResponse the instance passed to the callback makes the error code accessible.

1. NETWORK_ERROR: There was a network error. For example, loss of internet connectivity.
2. INVALID_OPTIONS: An issue with options passed in Razorpay.open.
3. PAYMENT_CANCELLED: The user canceled the payment.
4. TLS_ERROR: TLS v1.1 or TLS v1.2 is not supported by the device.
5. UNKNOWN_ERROR: An unknown error occurred.

****** Events Names ******

The event names have been uncovered as strings by the Razorpay class.

> EVENT_PAYMENT_SUCCESS: The payment was successful.

> EVENT_PAYMENT_ERROR: The payment was not successful.

> EVENT_EXTERNAL_WALLET: An external wallet was selected. 

pubsec.yaml

cupertino_icons: ^0.1.3
razorpay_flutter: ^1.2.3
fluttertoast: ^7.1.6

main.dart

import 'package:flutter/material.dart';
import 'package:flutterrazorpayintegration/Home.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // primarySwatch: Colors.deepPurple,
        primarySwatch: Colors.deepPurple,
      ),
      home: Home(),
    );
  }
}

 Home.dart

import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:flutter/cupertino.dart';
import 'package:razorpay_flutter/razorpay_flutter.dart';
import 'package:fluttertoast/fluttertoast.dart';

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  Razorpay razorpay;
  TextEditingController textEditingController = new TextEditingController();
  FocusNode textFocusController = FocusNode();
  var msg;

  @override
  void initState() {
    super.initState();

    razorpay = new Razorpay();

    razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, handlerPaymentSuccess);
    razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, handlerErrorFailure);
    razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, handlerExternalWallet);
  }

  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    razorpay.clear();
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () => textFocusController.unfocus(),
      child: Scaffold(
        appBar: AppBar(
          title: const Text("Razor Pay"),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Container(
                width: 200,
                child: TextField(
                  focusNode: textFocusController,
                  cursorRadius: Radius.zero,
                  textAlign: TextAlign.center,
                  controller: textEditingController,
                  decoration: const InputDecoration(hintText: "Amount",),
                  style: const TextStyle(fontSize: 35.0),
                ),
              ),
              const SizedBox(
                height: 20,
              ),
              Container(
                height: 50,
                child: RaisedButton(
                  color: Colors.deepPurple,
                  child: Text(
                    "Pay",
                    style: const TextStyle(color: Colors.white,fontSize: 30),
                  ),
                  onPressed: () {
                    openCheckout();
                  },
                ),
              )
            ],
          ),
        ),
      ),
    );
  }

  void openCheckout() {
    var options = {
      "key": "Use Your API Key Id here",
      "amount": num.parse(textEditingController.text) * 100, // Convert Paisa to Rupees
      "name": "Test Payment By Kamlesh",
      "description": "This is a Test Payment",
      "timeout": "180",
      "theme.color": "#03be03",
      "currency": "INR",
      "prefill": {"contact": "2323232323", "email": "[email protected]"},
      "external": {
        "wallets": ["paytm"]
      }
    };

    try {
      razorpay.open(options);
    } catch (e) {
      print(e.toString());
    }
  }

  void handlerPaymentSuccess(PaymentSuccessResponse response) {
    print("Pament success");
    msg = "SUCCESS: " + response.paymentId;
    showToast(msg);
  }

  void handlerErrorFailure(PaymentFailureResponse response) {
    msg = "ERROR: " + response.code.toString() + " - " + jsonDecode(response.message)['error']['description'];
    showToast(msg);
  }

  void handlerExternalWallet(ExternalWalletResponse response) {
    msg = "EXTERNAL_WALLET: " + response.walletName;
    showToast(msg);
  }

  showToast(msg){
    Fluttertoast.showToast(
      msg: msg,
      toastLength: Toast.LENGTH_LONG,
      gravity: ToastGravity.BOTTOM,
      timeInSecForIosWeb: 1,
      backgroundColor: Colors.grey.withOpacity(0.1),
      textColor: Colors.black54,
    );
  }

}

Thanks for reading. Now you would have Mastered up to 95% of the Razorpay concepts for a flutter. Feeling Confident enough now. Yeah, that's what this post was meant to be.

By Kamlesh Pandey

Thank You.

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