paytm_webview.dart

import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

class WebViewContainer extends StatefulWidget {
  final url;
  WebViewContainer(this.url);
  @override
  createState() => _WebViewContainerState();
}

class _WebViewContainerState extends State<WebViewContainer> {
  _WebViewContainerState();
  @override
  void initState() {
    final flutterWebviewPlugin = new FlutterWebviewPlugin();
    super.initState();
    flutterWebviewPlugin.onUrlChanged.listen((String url) {
      print(url);
      if (url.contains("payment_success")) {
        flutterWebviewPlugin.close();
        Navigator.of(context).pushNamedAndRemoveUntil('/payment_success', ModalRoute.withName('/home'));

      } else if(url.contains("payment_pending")) {
        flutterWebviewPlugin.close();
        Navigator.of(context).pushReplacementNamed('/payment_pending');
      }
      else if(url.contains("payment_failure")) {
        flutterWebviewPlugin.close();
        Navigator.of(context).pushReplacementNamed('/payment_failure');
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    print(widget.url);
    return SafeArea(
      child: WebviewScaffold(
        url: widget.url,
        hidden: false,
      ),
    );
  }
}