WP WooCommerce Mailchimp

3.2.0 – Apr 7, 2026

• Feature: add Upgrade to Pro upsell on settings page and style plugin row link
• Fix: remove early __() calls in constructors to resolve WP 6.7+ textdomain notice

3.1.0 – Apr 2, 2026

• Feature: remove bundled Action Scheduler in favor of WooCommerce built-in
• Fix: remove bundled Action Scheduler — use WooCommerce’s built-in copy
• Fix: update readme with block checkout, pro features, and requirements
• Fix: use –ignore-platform-reqs for composer install in CI

3.0.5 – Apr 1, 2026

• Fix: bump WP tested up to 6.9.4

3.0.4 – Apr 1, 2026

• Fix: rewrite SVN deploy to match proven release.sh approach

3.0.3 – Apr 1, 2026

• Fix: remove release-please markers from readme.txt Stable tag

3.0.2 – Apr 1, 2026

• Fix: use block annotation for version marker in plugin header

3.0.1 – Apr 1, 2026

• Fix: use full SVN trunk checkout in release workflow

3.0.0 – Apr 1, 2026

• Minimum requirements raised to PHP 7.4+, WordPress 6.2+, and WooCommerce 8.3+. Sites running older versions must upgrade before updating this plugin.
• Feature: add block-based checkout support
• Fix: install SVN in CI for WordPress test suite setup
• Fix: match existing readme.txt changelog format in release-please workflow
• Fix: symlink WooCommerce for test bootstrap and add SVN to release workflow
• mark 3.0 release

2.5.1 – Oct 27, 2025

• Fix plugin text domain hook.

2.5.0 – Oct 22, 2025

• Add additional caching of MailChimp lists, interest groups, segments and categories.
• Add explicit cache clearing to settings page.

2.4.17 – Jul 7, 2025

• Move load of plugin text domain to after init.

2.4.16 – Jun 24, 2025

• Fix dynamic properties deprecation.
• Bump WC tested version up to 9.9.5.

2.4.15 – Jun 19, 2025

• Fix dynamic properties deprecation.
• Bump WC tested version up to 9.9.4.
• Bump WP tested version up to 6.8.1.

2.4.14 – Sep 5, 2024

• Bump WC tested version up to 9.2.3.
• Bump WP tested version up to 6.6.1.

2.4.13 – Apr 11, 2024

• Bump WC tested version up to 8.7.0.
• Bump WP tested version up to 6.5.2.

2.4.12 – Aug 10, 2023

• Support for WooCommerce HPOS (High Performance Order Storage).
• Bump WC tested version up to 8.0.1.
• Bump WP tested version up to 6.3.

2.4.11 – Jul 20, 2023

• PHP 8+ exception bug fix – check if array key exists.

2.4.10 – Jul 19, 2023

• Bump WC tested version up to 7.9.0.
• Bump WP tested version up to 6.2.2.

2.4.9 – Mar 10, 2022

• Bug fix for to check for WP_Error.

2.4.8 – Oct 12, 2021

• Bug fix for tags not passing to Mailchimp.

2.4.7 – Oct 6, 2021

• Update to pass skip_merge_validation argument when subscribing users.

2.4.6 – Oct 5, 2021

• Enhance error logging.

2.4.5 – Oct 5, 2021

• Only send merge fields if not empty.
• Bump WC tested version up to 5.7.1.
• Bump WP tested version up to 5.8.1.

2.4.4 – May 26, 2021

• Fix typo.

2.4.3 – May 26, 2021

• Replace extract with explicit retrieval.

2.4.2 – May 24, 2021

• Tested up to WordPress 5.7.2
• Tested up to WooCommerce 5.3.0

2.4.1 – March 27, 2021

• Added new ss_wc_mailchimp_subscribe_customer hook to allow easier override of whether or not to subscribe the customer.

2.4.0 – March 24, 2021

• Tested up to WordPress 5.7
• Tested up to WooCommerce 5.1

2.3.13 – January 5, 2021

• Bump WP and WC tested versions.
• Fix for category interests not returning (issue #29)

2.3.12 – April 14, 2020

• Remove explicit private variable to fix integration issue with Aero Checkout.

2.3.11 – April 8, 2020

• Tested up to WordPress 5.4
• Tested up to WooCommerce 4.0.1

2.3.10 – March 3, 2020

• Increase API return limit count to 500.
• Tested up to WooCommerce 3.9.2

2.3.9 – February 1, 2020

• Fix for migration version detection.

2.3.8 – February 1, 2020

• Fix for array_map (Issue #26)
• Tested up to WordPress 5.3.2 (Issue #28)
• Tested up to WooCommerce 3.9.1 (Issue #27)

2.3.7 – October 31, 2019

• Fix for opt-in checkbox not displaying.

2.3.6 – October 30, 2019

• Fix json encode.

2.3.5 – October 30, 2019

• WordPress coding standards updates.

2.3.4 – October 29, 2019

• Change plugin display name.
• Sanitize post data.

2.3.3 – August 29, 2019

• Fix ActionScheduler 2.2.5 version.

2.3.2 – August 27, 2019

• Upgrade ActionScheduler to 2.2.5
• Fix encoding of unicode/international characters.

2.3.1 – August 26, 2019

• Fix tag retrieval to return tag IDs.
• Fix migrations.
• Tested up to WooCommerce 3.7.0

2.3.0 – July 25, 2019

• Added support for tags on main list.
• Improved integration with WooCommerce Mailchimp Pro.

2.2.0 – July 23, 2019

• Bump min WC version to 3.5.0, and min WP version to 4.7.0.
• Bump min PHP version to 5.6 in prep for WooCoommerce 3.7 requirements.

2.1.21 – July 23, 2019

• Prep for getting list tags.

2.1.20 – July 22, 2019

• Bump plugin version and min WP and WC tested versions.

2.1.19 – February 15, 2019

• Update styling of opt-in checkbox.

2.1.18 – February 15, 2019

• Add subscribe_customer param to before/after subscribe hooks.
• Use new logging action for logging.
• Update tested to WP 5.1

2.1.17 – February 14, 2019

• Allow html (hyperlinks, etc.) in Opt-In Field Label.

2.1.16 – February 5, 2019

• Force plugin version update. WordPress.org not registering the 2.1.15 release.

2.1.15 – February 5, 2019

• Fix fatal error.

2.1.14 – February 5, 2019

• Fix MailChimp interest group limit

2.1.13 – January 29, 2019

• WooCommerce tested up to 3.5.4
• WP tested up to 5.0.3

2.1.12 – May 22, 2018

• WPML Opt-in label fix.
• Plugin now loads after plugins_loaded action hook.

2.1.11 – April 27, 2018

• Fix erroneous error saying can’t load lists when no interest groups for list.

2.1.10 – February 12, 2018

• Added WooCommerce tested up to header

2.1.9 – February 1, 2018

• Added new opt-in checkbox location for order review above cart/product table.

2.1.8 – February 1, 2018

• Fix “Invalid argument supplied for foreach” warning in settings (Issue #21)

2.1.6 – January 26, 2018

• Restore opt-in checkbox location and add params to filter to allow easier adjustment of its placement.

2.1.5 – January 25, 2018

• Move opt-in checkbox before associated label

2.1.4 – December 20, 2017

• Tested up to WordPres 4.9.1

2.1.3 – December 19, 2017

• Small fix to show MailChimp API error message in UI.

2.1.2 – August 25, 2017

• Fix retrieval of mailchimp lists with numeric ids.

2.1.1 – July 24, 2017

• Fix settings default for older PHP versions.

2.1.0 – April 26, 2017

• Added support for WooCommerce 3.0 changes.
• Added additional options for opt-in checkbox placement.

2.0.20 – February 1, 2017

• Added woocommerce_mailchimp_admin_email filter to allow hooking into and overriding email where error messages are sent (defaults to get_option( ‘admin_email’ ) ).

IMPORTANT: You must upgrade to version 2.X by December 31, 2016 as prior versions of the MailChimp API will stop working at that point.

2.0.19 – October 4, 2016

• Fix to not send double opt-in email to existing subscribers.

2.0.18 – September 23, 2016

• Fix for array_filter not working with lamda for some users.

2.0.15 – 2.0.17 – September 22, 2016

• Fix for activation error running migrations.
• Double opt-in fix.
• Added additional hooks and filters.
• Code cleanup.

2.0.13 – 2.0.14 – September 20, 2016

• Added plugin compatibility checks for minimum supported versions of WooCommerce, WordPress and PHP.
• Added explicit plugin directory to require_once calls.

2.0.9 – 2.0.12 – September 19, 2016

• Small fix for double-loading of lists on api key change.
• Small fix for lists not loading after initial save on new installs.
• Small fix for new installs not loading interest groups.
• Removed functions.php file (no longer used).

2.0.7 – 2.0.8 – September 17, 2016

• Fix for new installs to prevent trying to run upgrade process.
• Small fix to not end WooCommerce Settings section with no api key or list is present.

2.0 – 2.0.6 – September 16, 2016

WARNING: This release contains breaking changes to the plugin’s action hooks and filters. If you have custom code that hooks into the plugins action hooks and filters, please review the breaking changes below to know how to update your code appropriately.

Breaking Changes

• Action filter ss_wc_mailchimp_subscribe_merge_vars is now ss_wc_mailchimp_subscribe_merge_tags
  • The filter no longer contains the GROUPINGS sub-key for MailChimp Groups due to a change with the MailChimp API v3.0.
  • The filter now only contains the MailChimp Merge Tags.
• MailChimp Groups now have their own action filter ss_wc_mailchimp_subscribe_interest_groups
• Action filter ss_wc_mailchimp_subscribe_options has changed due to changes with the MailChimp API v3.0.
  • The key listid has been changed to list_id in the $subscribe_options parameter
  • The vars key has been removed from the $subscribe_options parameter (this key previously contained the merge tags and groups together).
  • The update_existing, replace_interests and send_welcome keys have been removed from the $subscribe_options parameter since they are no longer supported by the API.
  • The plugin now always updates existing subscribers if they exist.
  • The plugin now always appends interest groups and does not affect existing groups on subscribers.
  • The send welcome email can be configured on the target list and is not required to be sent through the API.
  • A new key merge_tags has been added and includes the $merge_tags array to be sent to the MailChimp API
  • A new key interest_groups has been added and includes the $interest_groups array to be sent to the MailChimp API

Improvements

• Added ability to pick MailChimp Interest Groups from drop-down list.
• Upgraded MailChimp API to v3.0

Additions

• Added Debug Log setting to enable/disable logging for troubleshooting purposes.
• Added System Info setting for troubleshooting purposes.
• New action hook ss_wc_mailchimp_loaded fired after the plugin has loaded.
• New action hook ss_wc_mailchimp_before_opt_in_checkbox fired before opt in checkbox is rendered.
• New action filter ss_wc_mailchimp_opt_in_checkbox allows for overriding opt in checkbox rendering
• New action hook ss_wc_mailchimp_after_opt_in_checkbox fired after opt in checkbox is rendered.

Fixes

• Fixed issues with translations and text domains not loading properly.
• Change list function to get_list to prevent PHP error
• Fix issues with PHP version < 5.5

1.3.9 – September 13, 2016

Fixes

• Rename MCAPI class to prevent collisions with other plugins.

1.3.8 – September 9, 2016

Improvements

• Tested up to WordPress 4.6.1
• Tested up to WooCommerce 2.6.4
• More flexible opt_in checkbox placement
• Pass $order_id to ss_wc_mailchimp_subscribe_options hook

Fixes

• Use only one instance of MCAPI
• Fixed Issue #14 MCAPI constructor style
• Fixed Issue #15 mailchimp_api_error_msg
• Fixed Issue #16 where lists wouldn’t show up until you saved the settings twice

1.3.7 – December 16, 2015

Improvements

• WordPress 4.4 Compatible
• WooCommerce 2.4.12 Compatible

Fixes

• API response not shown in debug log
• Use only one instance of MCAPI

1.3.6 – February 9, 2015

Fixes

• Backout of change to use WC_Logger due to fatal error

1.3.5 – February 6, 2015

Improvements

• Change to use WC_Logger instead of error_log
• Updated pot file
• Added French translation
• General code syntax cleanup

Fixes

• Fix for undefined variable list and array_merge issue.

1.3.3 & 1.3.4 – January 16, 2016

Fixes

• Fix enabled check. Issue #6.
• Fix for transient key length.

Improvements

• Tested with WordPress 4.1

1.3.2 – November 4, 2014

**Fixes*

• Fix for headers already sent message. Tested with WordPress 4.0 and WooCommerce 2.2.*

1.3.1 – April 3, 2014

Fixes

• Fix for MailChimp merge vars bug introduced in v1.3

1.3 – April 1, 2014

Breaking Changes

• Action filer ss_wc_mailchimp_subscribe_merge_vars now passes $order_id param to enable retrieving additional order info/meta to use in MailChimp merge vars

Fixes

• Small fix to order_created subscribe event to work with PayPal Payment Gateway

1.2.6 – February 28, 2014

Improvements

• Added additional debug logging when WP_DEBUG is enabled

1.2.5 – February 27, 2014

Fixes

• Bug fix for subscribe when not using opt-in display field

1.2.2, 1.2.3 & 1.2.4 – February 22, 2014

Fixes

• WooCommerce 2.1 fix for order custom fields
• Fixed plugin settings link for WooCommerce 2.1
• Bug fix for subscribe

1.2.1 – February 13, 2014

Improvements

• WooCommerce 2.1 integration: Change to use wc_enqueue_js instead of add_inline_js
• WooCommerce 2.1 integration: Change to support new default checkout field filter for default opt-in checkbox status

1.2 – January 10, 2014

Improvements

• Added new setting to control whether or not the double opt-in checkbox is checked/unchecked by default on the checkout page.
• Added new setting to control display location of the double opt-in checkbox (under billing info or order info)
• Small modification to append to MailChimp interest groups for existing users so that group settings are not lost for users who were already subscribed.
• Preparations for i18n (Internationalization) support. Several users have already asked and offered to translate the plugin into other languages. We had always planned on that, but now are making that a reality.

1.1.2 & 1.1.3 – January 2, 2014

Fixes

• Update to REALLY address issue with subscriptions not occurring on order create “pending”

Additions

• Minor action hook change since order meta (needed for MailChimp API call) is not yet available on ‘woocommerce_new_order’ hook

– January 2, 2014

1.1.1 – December 31, 2013

Fixes

• Update to address issue with subscriptions not occurring on order create “pending”

1.1 – November 12, 2013

Improvements

• Add the option to display an opt-in field on checkout

1.0.2 – October 16, 2013

Additions

• Minor text and comment changes

1.0.1 – October 11, 2013

Improvements

• Added “Settings” link on the Plugins administration screen

1.0 – October 10, 2013

• This is the first public release.