Download ezchimp for only $10 including lifetime free updates! And it is open source, licensed under GPLv3.

When clients sign up, they will get the options like this:

Mailing list client options

Clients will also get the mailing list and interest group options in their client area:

Client area my details

Client area mailing list options

Follow on twitter for updates: ezchimp

Get it here for only $10 including lifetime free support and updates!

Steps to setup:

1. Download and extract the ezchimp.tar.gz file into your modules/addons/ folder within your WHMCS directory.
2. Move the ezchimp_webhook.php file to your WHMCS root directory (eg: /home/username/public_html/whmcs). Test and make sure http://yourdomain.com/whmcs/ezchimp_webhook.php is giving a blank page instead of any errors such as internal server error (500). If it does, check and fix the ownership (should be owned by the domain’s username on a cpanel server for example), permission (try 555) etc so that it works.
3. Go to WHMCS admin -> Setup -> Addon Modules and “activate” the module listed as “MailChimp newsletter”
4. Set the WHMCS base URL (eg: http://yourdomain.com/whmcs, since version 1.6 only, not displayed in screenshot below).
5. After successful activation enter you MailChimp API key and set access control below in the same page:
   

   ezchimp addon activation

6. Go to “Addons” -> “MailChimp newsletter” and configure the settings as necessary:
   

   ezchimp settings

7. Click on “Lists & Groups” in right menu to display all mailing lists and interest groups in your Mailchimp account:
   

   Mailchimp lists and interest groups

8. Enable those you need to make available for your clients in WHMCS. Give an alias as you wish. If you do not specify an alias, the name of the interest group (or the name of the list if there are no interest groups in it) will be used.
9. The “Status” link in side menu will display the subscription status of your clients and their sub-contacts to mailing lists and interest groups:
   

   echimp subscription status

10. Use the “Tools” link to initially subscribe existing clients after a fresh activation of ezchimp module:
    

    ezchimp initial subscribing

     

    All text can be modified by editing the file english.php in the ezchimp/lang/ folder. You may also add support for other languages by creating a new file for the language in ezchimp/lang/ folder.

Subscribe your clients in WHMCS to required mailing list and interest groups in your MailChimp account based on the product group they order.

Suppose you want to auto subscribe your client to “Hosting” interest group in your MailChimp mailing list when they order one of your “Web Hosting” product and to “Domains” interest group when they purchase one of your “Domain” product, this script can do it for you. You can organize your clients to different interest groups easily and send newsletters and special offers to specific interest groups for maximum effective email marketing.

This script makes use of WHMCS AcceptOrder hook and WHMCS and MailChimp APIs.

Thanks to Juan Manuel Zolezzi Volpi, Duplika Internet Solutions for the idea and funding for the development of this script and permission to share it.

Steps to setup:

1. Set values for config variables and WHMCS product group to MailChimp mailing list and interest groups map
2. Upload this script to includes/hooks folder inside your WHMCS install folder
3. Make sure the merge fields in mailchimp mailing list are set as:
   

   Mailchimp merge fields

4. Test by accepting an order

For setup assistance, customizations or consultation, contact support[at]admod.com

Steps to setup:

1. Download the zip file using the link provided below and extract it to get the script
2. Edit the script and set an access password and other configuration values
3. Upload the script to a web server where it can be accessed from outside
4. Login to your WHMCS admin account
5. Go to Setup -> General Settings -> Security
6. Add the IP of your web server where you placed the script in “API IP Access Restriction“
7. Save changes
8. Login to your Zendesk admin account
9. Go to SETTINGS -> Extensions
10. Click on “add widget“
11. Select “Custom” (Custom HTML fragments to embed in your pages.)
12. In “Title“, enter “Customer Info” (or any name you like for the widget title)
13. Check (enable) “Display“
14. In “Available for“, select “People who have logged in and is an agent“
15. In “Content“, enter the following (replace URL_TO_THE_SCRIPT with the URL depending on where you uploaded this script and ACCESS_PASSWORD with what you set for $access_password in the script):<script type=”text/javascript”>Widget.require(‘URL_TO_THE_SCRIPT?password=ACCESS_PASSWORD&email={{ticket.requester.email}}&debug=1′, {type: ‘text/javascript’});</script> <div id=’whmcs_user’></div>
16. Select “Create widget“
17. Click “Submit” button
18. Now view any ticket in Zendesk
19. In the right pane, click “Edit widgets on this page“
20. Click the newly added widget from the list
21. Drag the new widget to where you want it

Security considerations: 

Script for WHMCS customer information Zendesk widget

Steps to setup:

1. Download the zip file using the link provided below and extract it to get the scripts
2. Login to your Zendesk admin account
3. Go to Settings -> Security -> Authentication
4. Enable “Single Sign-On“
5. Select “Zendesk Remote Auth” in “Mode“
6. Set the URL of the login script in “Remote login URL“
7. Set the URL of the logout script in “Remote logout URL“
8. Set your IP in the “IP ranges” for testing. Your current IP address will be displayed below the field. (Clear this field after testing and save it)
9. Copy the token (shared secret)
10. Click “Save tab” button at the bottom of the page
11. Login to your WHMCS admin account
12. Go to Setup -> General Settings -> Security
13. Add the IP of your web server where you placed the script in “API IP Access Restriction“
14. Edit the scripts and set values for config variables such as token, URLs, WHMCS login etc.
15. Upload the scripts to a folder on your web server. Should be on the same domain where your WHMCS is also hosted in order for autologin to work.

Security considerations: