FlutterFlow and Constant Contact integration: Step-by-Step Guide 2024

   

• Sign Up / Log In: If you don't already have a Constant Contact account, go to the Constant Contact website and sign up. If you already have an account, log in.
• API Access: After logging in, navigate to the Constant Contact developer portal. You can find this under the "Account" settings or by visiting here.
• Create an API Key: Click on "Get Started" or "Create API Key". Fill in the necessary details like application name, description, and redirect URI. Make sure to clearly define the redirect URI as it will be required later.
• API Key & Secret: After submission, you will receive an API Key and Secret. Note these down as they will be required later for authentication.

   

• Sign Up / Log In: If you're new to FlutterFlow, go to the FlutterFlow website and sign up. If you already have an account, log in.
• Create a Project: Click on "Create New Project". Follow the prompts to define the project name, description, and initial settings.
• UI Design: Begin by designing the user interface for your FlutterFlow application as required. Make sure to include fields related to Constant Contact, such as email input fields, sign-up buttons, etc.

   

• Navigate to "Settings": In your FlutterFlow project, navigate to the "Settings" tab found on the left-side menu.
• Add Packages: Click on "Add Package" and search for packages like http which will allow you to make HTTP requests to the Constant Contact API. Install this package by clicking on "Add".
• Other dependencies: Add additional dependencies that you might require for HTTP handling or JSON parsing like json\_annotation, provider, etc.

   

Backend Setup Code:

Create a ConstantContactService.dart file.

import 'package:http/http.dart' as http;
import 'dart:convert';

class ConstantContactService {
  static const String apiKey = "YOUR_API_KEY";
  static const String apiSecret = "YOUR_API_SECRET";
  static const String baseUrl = "https://api.cc.email/v3";

  // Function to get an access token
  Future<String> getAccessToken(String authCode) async {
    final response = await http.post(
      Uri.parse('$baseUrl/idfed/token'),
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        'Authorization': 'Basic ' + base64Encode(utf8.encode('$apiKey:$apiSecret')),
      },
      body: {
        'code': authCode,
        'redirect_uri': 'YOUR_REDIRECT\_URI',
        'grant_type': 'authorization_code',
      },
    );

    if (response.statusCode == 200) {
      final parsed = json.decode(response.body);
      return parsed['access\_token'];
    } else {
      throw Exception('Failed to load access token');
    }
  }

  // Function to add a contact
  Future<void> addContact(String accessToken, Map<String, dynamic> contact) async {
    final response = await http.post(
      Uri.parse('$baseUrl/contacts'),
      headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer $accessToken',
      },
      body: json.encode(contact),
    );

    if (response.statusCode != 201) {
      throw Exception('Failed to add contact');
    }
  }
}

   

• OAuth Authentication: Constant Contact uses OAuth for authentication. You'll need to implement a login flow that redirects users to Constant Contact's OAuth login page and then back to your FlutterFlow app.
• Example Code:

import 'package:flutter/material.dart';
import 'package:your_project_name/services/ConstantContactService.dart';
import 'package:webview_flutter/webview_flutter.dart';

class AuthScreen extends StatefulWidget {
  @override
  _AuthScreenState createState() => _AuthScreenState();
}

class \_AuthScreenState extends State<AuthScreen> {
  late WebViewController \_controller;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Login to Constant Contact'),
      ),
      body: WebView(
        initialUrl: 'https://api.cc.email/v3/oauth2/authorize?response_type=code&client_id=$apiKey&redirect_uri=YOUR_REDIRECT_URI&scope=contact_data',
        javascriptMode: JavascriptMode.unrestricted,
        onWebViewCreated: (WebViewController webViewController) {
          \_controller = webViewController;
        },
        navigationDelegate: (NavigationRequest request) {
          if (request.url.startsWith('YOUR_REDIRECT_URI')) {
            final uri = Uri.parse(request.url);
            final authCode = uri.queryParameters['code'];

            if (authCode != null) {
              ConstantContactService().getAccessToken(authCode).then((accessToken) {
                Navigator.of(context).pop(accessToken);
              });
            }
            return NavigationDecision.prevent;
          }
          return NavigationDecision.navigate;
        },
      ),
    );
  }
}

   

Create Contact Screen:

import 'package:flutter/material.dart';
import 'package:your_project_name/services/ConstantContactService.dart';

class AddContactScreen extends StatefulWidget {
  final String accessToken;

  AddContactScreen({required this.accessToken});

  @override
  _AddContactScreenState createState() => _AddContactScreenState();
}

class \_AddContactScreenState extends State<AddContactScreen> {
  final \_formKey = GlobalKey<FormState>();
  String \_email = '';
  String \_firstName = '';
  String \_lastName = '';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Add Contact'),
      ),
      body: Form(
        key: \_formKey,
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            children: <Widget>[
              TextFormField(
                decoration: InputDecoration(labelText: 'Email'),
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return 'Please enter an email';
                  }
                  \_email = value;
                  return null;
                },
              ),
              TextFormField(
                decoration: InputDecoration(labelText: 'First Name'),
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return 'Please enter a first name';
                  }
                  \_firstName = value;
                  return null;
                },
              ),
              TextFormField(
                decoration: InputDecoration(labelText: 'Last Name'),
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return 'Please enter a last name';
                  }
                  \_lastName = value;
                  return null;
                },
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: () {
                  if (\_formKey.currentState?.validate() ?? false) {
                    Map<String, dynamic> contact = {
                      'email_addresses': [{'email_address': \_email}],
                      'first_name': _firstName,
                      'last_name': _lastName,
                    };
                    ConstantContactService().addContact(widget.accessToken, contact).then((value) {
                      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Contact Added Successfully')));
                    }).catchError((error) {
                      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Failed to add contact: $error')));
                    });
                  }
                },
                child: Text('Add Contact'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

   

• Run the App: Build and run the app using FlutterFlow's building and testing tools.
• Check API Calls: Verify that the API calls to Constant Contact are working as expected. This can be done by confirming that the contacts are being successfully added to your Constant Contact account.
• Debugging: Use the debugging tools provided by FlutterFlow and your IDE (e.g., Visual Studio Code, Android Studio) to debug any issues.

   

• UI Improvements: Make any necessary improvements to the UI for a better user experience.
• Exception Handling: Add comprehensive error handling to ensure that users are informed in case something goes wrong.
• Documentation: Document your code and the steps for future reference or for other developers.

   

By following these steps, you should now have a FlutterFlow application integrated with Constant Contact, capable of creating contacts through a streamlined user interface.