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chimpXpress is a Mailchimp integration for WordPress. It allows you to create blog posts from existing Mailchimp campaigns and create new campaign drafts from within WordPress by using your blog posts as campaign content. 
If you’re having trouble with the plugin visit our <a href="https://chimpxpress.com/support" rel="nofollow ugc">support forum</a> – Thank you!
<h4>What is Mailchimp?</h4>
Mailchimp is an award-winning marketing platform that allows you to send email campaigns to a list of subscribers. It is free for up to 500 contacts, which is why it is the newsletter-service of choice for thousands of small businesses across the globe.
If you are not yet using Mailchimp, <a href="https://mailchimp.com/signup" rel="nofollow ugc">creating an account is 100% free and only takes you about 30 seconds</a>.
<h3>3rd Party or External Services</h3>
The main goal of this plugin is to create a bridge between your WordPress site and Mailchimp. In order to accomplish this the plugin will initiate connections to the Mailchimp Marketing API through encrypted network connections. This is required to send and retrieve data between your site and Mailchimp, such as: templates, recently sent campaigns, name and size of subscriber lists and more.
You can learn more about the Mailchimp Marketing API <a href="https://mailchimp.com/developer/marketing/" rel="nofollow ugc">here</a>. 
Also take a look at the <a href="https://mailchimp.com/legal/" rel="nofollow ugc">Mailchimp Terms and Privacy Statements</a>.
This plugin does not collect any user data of your site’s visitors. However, you can choose to include Google Analytics tracking codes in the Landing Pages you import from Mailchimp to your WordPress site. Doing so will allow Google Analytics to collect all sorts of user data. This is optional and will only be enabled if you enter your Google Analytics Profile ID in the configuration.
<a href="https://marketingplatform.google.com/about/analytics/" rel="nofollow ugc">What is Google Analytics</a> 
You can learn more about Google’s Privacy Policy <a href="https://policies.google.com/privacy?hl=en-US" rel="nofollow ugc">here</a>.

chimpXpress

chimpXpress - The Mailchimp WordPress Integration

Jason Coleman

Paid Memberships Pro

David Parker

Subscribe WordPress users and members to your Mailchimp audiences.
This plugin offers extended functionality for <a href="https://wordpress.org/plugins/paid-memberships-pro/" rel="ugc">membership websites using the Paid Memberships Pro plugin</a> available for free in the WordPress plugin repository.
With Paid Memberships Pro installed, you can specify unique audiences for each membership level, as well as opt-in audiences that a member can join as part of checkout or by editing their user profile. By default, the integration will merge the user’s email address and membership level information. You can send additional user profile details to Mailchimp <a href="https://www.paidmembershipspro.com/send-additional-user-information-fields-mailchimp/" rel="nofollow ugc">using the method described here</a>.
The settings page allows the site admin to specify which audience lists to assign users and members to plus additional features you may wish to adjust. The first step is to connect your website to Mailchimp using your account’s API Key. Here’s how to find the API key in Mailchimp:
<iframe loading="lazy" title="How To Find Your Mailchimp API Key" width="750" height="422" src="https://www.youtube.com/embed/ctcy1_npmRE?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
<h4>Additional Settings</h4>
<ul>
<li>Non-member Audiences: These are the audiences that users will be added to if they do not have a membership level. They will also be removed from these audiences when they gain a membership level (assuming the audiences are not also set in the “Membership Levels and Audiences” option for their new level).</li>
<li>Opt-in Audiences: These are the audiences that users will have the option to subscribe to during the PMPro checkout process. Users are later able to update their choice from their profile. Audiences set as Opt-in Audiences should not also be set as a Non-member Audience nor a Level Audience.</li>
<li>Require Double Opt-in?: If set to “Yes (All audiences)”, users will be set to “Pending” status in Mailchimp when they are added to an audience instead of being subscribed right away. They will then receive an email from Mailchimp to opt-in to the audience.</li>
<li>Unsubscribe on Level Change?: If set to “No”, users will not be automatically unsubscribed from any audiences when they lose a membership level. If set to “Yes (Only old level audiences.)”, users will be unsubscribed from any level audiences they are subscribed to when they lose that level, assuming that audience is not a Non-Member audience as well. If set to “Yes (Old level and opt-in audiences.)”, users will also be unsubscribed from opt-in audiences when they lose their membership level (though they can re-subscribe by updating the setting on their profile).</li>
<li>Update on Profile Save: If set to “Yes”, PMPro will update Mailchimp audiences whenever a user’s profile page is saved. If set to “No”, PMPro will only update Mailchimp when a user’s membership level is changed, email is changed, or chosen opt-in audiences are changed.</li>
<li>Log API Calls?: If set to “Yes”, API calls to Mailchimp will be logged in the <code>/pmpro-mailchimp/logs</code> folder.</li>
<li>Membership Levels and Audiences: These are the audiences that users will automatically be subscribed to when they receive a membership level.</li>
</ul>

Paid Memberships Pro – Mailchimp Add On

I've had no issues with this add-on for PMPro, works as expected and really easy to setup! Great job!

Easily add members to my mailchimp

Add users and members to Mailchimp audiences based on their membership level and allow members to opt-in to specific audiences.

chimpXpress vs Paid Memberships Pro – Mailchimp Add On