Akshar Soft Solutions

Plugin allow you to integrate your Memberpress Plugin with Campaign Monitor optin
Usage
Basic usage
Once you have installed and activated the plugin, navigate to Memberpress, Settings, Marketing. You will find Campaign Monitor in list. 
Enable Campaign Monitor and enter your API Key and save changes. After that you will see your Campaign Monitor List in Edit Membership Advanced tab. Select appropriate list and label also you can put legal notice for optin if required.
IMPORTANT NOTES
This plugin sends data to Campaign Monitor. You can find more details at https://www.campaignmonitor.com/.
Plugin is using API & API Wrapper mentioned at https://www.campaignmonitor.com/api/
<h3>Requirements</h3>
<ul>
<li>PHP 5.3 or higher</li>
</ul>
<h3>Translations</h3>
<ul>
<li>None</li>
</ul>

AS MemberPress Campaign Monitor Integration

Integrate Campaign Monitor Optin with your Memberpress Plugin

Formcrafts

This add-on allows you to add subscribers to your Campaign Monitor lists, with forms made with <a href="http://formcraft-wp.com/" rel="nofollow ugc">FormCraft</a>. You can read the tutorial <a href="http://formcraft-wp.com/help/how-to-configure-campaign-monitor-add-on/" rel="nofollow ugc">here</a>
Please note that this add-on works with <a href="http://formcraft-wp.com/" rel="nofollow ugc">FormCraft Premium</a>, and not <a href="https://wordpress.org/plugins/formcraft-form-builder/" rel="ugc">FormCraft Basic</a>

Campaign Monitor Add-On for FormCraft

Create gorgeous optin forms for your site  with FormCraft, and grow your Campaign Monitor list.

AS MemberPress Campaign Monitor Integration vs Campaign Monitor Add-On for FormCraft