MailChimp Authentication In Salesforce - Easy Steps (Authentication Part 3)

I hope following post might have helped you in authentication:

1) Dropbox Authentication In Salesforce - Easy Setup (Authentication Part 1)

2) Google Drive Authentication In Salesforce - Easy Setup (Authentication Part 2)

So here is the third part of the series, authentication with MailChimp

The whole process of authentication with Mailchimp is divided into some simple steps :

Step 1:- First of all to authenticate with Mailchimp, you must have an account on Mailchimp if not then sign up here.

Step 2:- Now create an app by selecting your name under the logo and select account.

Step 3:- Here as you can see in the given image below, select registered app and register an app here.

Step 4:- Once you've entered the details for your Company and Application and saved them, your client_id and client_secret will be displayed at the bottom of the "edit" page for your application.

Note: - Keep in mind that Redirect Uri is the Uriof your page where you want to be redirected with the "code" parameter.

Step 5:- Now create an apex class and paste the below code in it.

publicwithsharingclassMailChimpIntegrationController
{
 public string client_id = 'Your ClientId';
 public string client_secret = 'Your ClientSecret';
 public string authorize_uri = 'https://login.mailchimp.com/oauth2/authorize';
 public string redirect_uri = 'https://c.na15.visual.force.com/apex/MailChimpIntegrationPage';
 
 publicMailChimpIntegrationController()
 {}
 
 publicPagereferenceauthorizeMailChimp()
 {
  authorize_uri = authorize_uri + '?response_type=code&client_id=' + client_id + '&redirect_uri=' + Encodingutil.urlEncode(redirect_uri , 'UTF-8');
PageReferencepg = newPageReference(authorize_uri) ;  
returnpg ;
 }
 
 publicvoidmailChimpAccessToken()
 {
  string code = ApexPages.currentPage().getParameters().get('code') ;  
  HttpRequestreq = newHttpRequest();  
req.setMethod('POST');  
req.setEndpoint('https://login.mailchimp.com/oauth2/token'); 
req.setHeader('content-type', 'application/x-www-form-urlencoded'); 
req.setHeader('Accept', 'application/json'); 
        String messageBody = 'grant_type=authorization_code&client_id=' + client_id + '&client_secret=' + client_secret + '&code=' + code + '&redirect_uri=' + Encodingutil.urlEncode(redirect_uri , 'UTF-8');
req.setHeader('Content-length', String.valueOf(messageBody.length()));  
req.setBody(messageBody);  
req.setTimeout(60*1000);  

        Http h = newHttp();  
        String resp;  
HttpResponse res = h.send(req);  
resp = res.getBody(); 

system.debug('+++++----json---with---Access-----token----++++++'+resp);
 }
}

Step 6:- Now create a visualforce page and paste the below code in it.

Step 7:- At last create a new remote site setting with value as below

-> Remote Site Name : MailChimp
-> Remote Site URL : https://login.mailchimp.com
-> Active : True

I hope now you can manipulate the code according to the need. As these simple buttons on VFP shows you how to authenticate and get the access tokens.

Cheers!