paytm 1.0.5

A Flutter plugin to use Paytm as a Payment gateway for accepting online payments in Flutter app.

example/lib/main.dart

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:paytm/paytm.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String payment_response = null;

  //Live
  String mid = "LIVE_MID_HERE";
  String PAYTM_MERCHANT_KEY = "LIVE_KEY_HERE";
  String website = "DEFAULT";
  bool testing = false;

  //Testing
  // String mid = "TEST_MID_HERE";
  // String PAYTM_MERCHANT_KEY = "TES_KEY_HERE";
  // String website = "WEBSTAGING";
  // bool testing = true;

  double amount = 1;
  bool loading = false;

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Paytm example app'),
        ),
        body: SingleChildScrollView(
          child: Padding(
            padding: EdgeInsets.all(10.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Text(
                    'Test Credentials works only on Android. Also make sure Paytm APP is not installed (For Testing).'),

                SizedBox(
                  height: 10,
                ),

                TextField(
                  onChanged: (value) {
                    mid = value;
                  },
                  decoration: InputDecoration(hintText: "Enter MID here"),
                  keyboardType: TextInputType.text,
                ),
                TextField(
                  onChanged: (value) {
                    PAYTM_MERCHANT_KEY = value;
                  },
                  decoration:
                      InputDecoration(hintText: "Enter Merchant Key here"),
                  keyboardType: TextInputType.text,
                ),
                TextField(
                  onChanged: (value) {
                    website = value;
                  },
                  decoration: InputDecoration(
                      hintText: "Enter Website here (Probably DEFAULT)"),
                  keyboardType: TextInputType.text,
                ),
                TextField(
                  onChanged: (value) {
                    try {
                      amount = double.tryParse(value);
                    } catch (e) {
                      print(e);
                    }
                  },
                  decoration: InputDecoration(hintText: "Enter Amount here"),
                  keyboardType: TextInputType.number,
                ),
                SizedBox(
                  height: 10,
                ),
                payment_response != null
                    ? Text('Response: $payment_response\n')
                    : Container(),
//                loading
//                    ? Center(
//                        child: Container(
//                            width: 50,
//                            height: 50,
//                            child: CircularProgressIndicator()),
//                      )
//                    : Container(),
                RaisedButton(
                  onPressed: () {
                    //Firstly Generate CheckSum bcoz Paytm Require this
                    generateTxnToken(0);
                  },
                  color: Colors.blue,
                  child: Text(
                    "Pay using Wallet",
                    style: TextStyle(color: Colors.white),
                  ),
                ),
                RaisedButton(
                  onPressed: () {
                    //Firstly Generate CheckSum bcoz Paytm Require this
                    generateTxnToken(1);
                  },
                  color: Colors.blue,
                  child: Text(
                    "Pay using Net Banking",
                    style: TextStyle(color: Colors.white),
                  ),
                ),
                RaisedButton(
                  onPressed: () {
                    //Firstly Generate CheckSum bcoz Paytm Require this
                    generateTxnToken(2);
                  },
                  color: Colors.blue,
                  child: Text(
                    "Pay using UPI",
                    style: TextStyle(color: Colors.white),
                  ),
                ),
                RaisedButton(
                  onPressed: () {
                    //Firstly Generate CheckSum bcoz Paytm Require this
                    generateTxnToken(3);
                  },
                  color: Colors.blue,
                  child: Text(
                    "Pay using Credit Card",
                    style: TextStyle(color: Colors.white),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  void generateTxnToken(int mode) async {
    setState(() {
      loading = true;
    });
    String orderId = DateTime.now().millisecondsSinceEpoch.toString();

    String callBackUrl = (testing
            ? 'https://securegw-stage.paytm.in'
            : 'https://securegw.paytm.in') +
        '/theia/paytmCallback?ORDER_ID=' +
        orderId;

    var url = 'https://desolate-anchorage-29312.herokuapp.com/generateTxnToken';

    var body = json.encode({
      "mid": mid,
      "key_secret": PAYTM_MERCHANT_KEY,
      "website": website,
      "orderId": orderId,
      "amount": amount.toString(),
      "callbackUrl": callBackUrl,
      "custId": "122",
      "mode": mode.toString(),
      "testing": testing ? 0 : 1
    });

    try {
      final response = await http.post(
        url,
        body: body,
        headers: {'Content-type': "application/json"},
      );
      print("Response is");
      print(response.body);
      String txnToken = response.body;
      setState(() {
        payment_response = txnToken;
      });

      var paytmResponse = Paytm.payWithPaytm(
          mid, orderId, txnToken, amount.toString(), callBackUrl, testing);

      paytmResponse.then((value) {
        print(value);
        setState(() {
          loading = false;
          payment_response = value.toString();
        });
      });
    } catch (e) {
      print(e);
    }
  }
}