Changelog ========= = 4.14.0 = _Release date: Aug 4, 2026_ - Integrations: Show the sign-up checkbox on the admin "Add New User" form. Thanks [arnelap](https://github.com/arnelap)! - Misc: Add a code snippet for sending the WordPress username to Mailchimp with User Sync. - Misc: Update WordPress Coding Standards to 3.4 and fix a few incorrect type annotations. = 4.13.1 = _Release date: Jun 22, 2026_ - Forms: Improve handling of pasted `

` wrapper tags in form content. - Forms: Remove `mc4wp_default_form_id` option. We now default to first available form. - Forms: Improve the `{email}` dynamic content tag by detecting common lowercase email field names. - Misc: Adhere to DB, Security, I18n sniffs from WordPress Coding Standards. - Misc: Prevent direct access to plugin configuration files. - Misc: Remove the plugin review request from the footer of plugin admin pages. - Security: Add Patchstack vulnerability disclosure instructions to the plugin FAQ and security policy. = 4.13.0 = _Release date: Jun 1, 2026_ - Improve performance by preloading core plugin classes and skipping dynamic content tag parsing when no tags are present. - Improve security for admin AJAX requests by adding a nonce check and stricter audience ID handling. - Improve dynamic content tag replacement by removing broken regular expressions. - Improve form preview output by disabling PHP error display during preview rendering. - Update JavaScript dependencies and pass admin script data using `wp_add_inline_script()`. = 4.12.6 = _Release date: May 26, 2026_ - Fix integrations losing runtime options like double opt-in when sign-up attempts are processed asynchronously. Thanks [Jon Parker](https://github.com/jnpkr)! - Fix Site Tracking Pixel setting not being saved when disabling it. - Improve accessibility of generated form fields by wrapping inputs in labels and using fieldsets for checkbox and radio fields. - Improve validation and sanitization of submitted form data. - Improve debug log safety by truncating overly long messages and improving email address obfuscation. Thanks [Jack Feldcher](https://github.com/jjf404)! = 4.12.5 = _Release date: May 8, 2026_ - Fix fatal error on plugin activation in some cases when wp_rand() returns a value below 10 for the minute part. Thanks [Tim Carr](https://www.wpzinc.com/)! = 4.12.3 = _Release date: May 5, 2026_ - Improved Mailchimp Site Tracking Pixel support. Site is now automatically discovered or registered in Mailchimp when feature is enabled. - Sign-up attempts for integrations are now processed asynchronously (via a scheduled event). - Ensure mc4wp_refresh_mailchimp_lists is scheduled in site's local timezone. - Added missing translator comments to all translatable strings. - General code hardening and minor improvements as reported by the Plugin Check tool. = 4.12.2 = _Release date: Apr 20, 2026_ - Add Mailchimp Campaign Archive block and [mc4wp_campaigns] shortcode to show an archive Mailchimp email campaigns. Thanks to [Faisal Ahammad](https://faisalahammad.com/)! - WooCommerce: Allow "after email" position for sign-up checkbox when using Checkout Block. - WooCommerce: Detect use of Checkout Block and only show available positions. - Show warning when cron is behind schedule. Thanks to [Faisal Ahammad](https://faisalahammad.com/)! - Add preliminary support for [Mailchimp Site Tracking Pixel](https://mailchimp.com/help/about-mailchimp-site-tracking-pixel/). Thanks to [Faisal Ahammad](https://faisalahammad.com/)! = 4.12.1 = _Release date: Mar 26, 2026_ - Supply a custom capability type to `register_post_type` for the `mc4wp-form` post type. - Limit allowed HTML in the various form messages to a safe subset on load (versus only on update). = 4.12.0 = _Release date: Mar 9, 2026_ - Remove the ability to unsubscribe through a form. You should migrate to the Mailchimp hosted form for this, which does email verification. - Add block properties so the form block can be reordered inside the Gutenberg editor. - Fix redirect not occuring after running MC4WP actions. - Various type fixes, PHPDoc improvements and removal of unused code. The following fixes and improvements were contributed by [Faisal Ahammad](https://faisalahammad.com/): - Add WP Forms field setting for configuring double opt-in. - Add PeepSo registration form integration. - Fix required validation for Ninja Forms integration. - Add autocomplete attribute to form fields. - Enable live updates in Gravity Forms editor. = 4.11.0 = _Release date: Jan 20, 2026_ - Add form setting to remove tags from existing subscribers. - Add form setting to check for common email typos. - In Prosopo integration, link directly to API key screen instead of user profile. - Automatically convert string fields to a comma-separated string if an array value is received. - Fix undefined key warning for new setting that emails to site administrator on errors. = 4.10.9 = _Release date: Nov 28, 2025_ - Specify `apiVersion` in call to `registerBlockType` so that WordPress 6.9 knows it can use the new iframe based editor. - Add new setting to send an email for critical errors, like API errors returned by Mailchimp. = 4.10.8 = _Release date: Oct 21, 2025_ - Show warning to administrators if a form is showing but Mailchimp API key is not set. - Update third-party JS dependencies. = 4.10.7 = _Release date: Sep 05, 2025_ - Handle renewing lists through server-side redirect instead of JS component. = 4.10.6 = _Release date: Jul 23, 2025_ - [WooCommerce Checkout] Fix checkbox from showing up in order confirmation email if using Checkout Block. - [Forms] Fix `{response}` tag being escaped. = 4.10.5 = _Release date: Jun 25, 2025_ - [Ninja Forms] Always show at least one list option so that onchange event fires properly (to load Audience fields). - Update third-party JS dependencies. - Optimize SVG icons for reduced file sizes. = 4.10.4 = _Release date: May 26, 2025_ - Improved context-dependent escaping in dynamic content tags. = 4.10.3 = _Release date: Apr 16, 2025_ - Update third-party JS dependencies. - Add message setting for when a form submission is marked as spam. - Log exact anti-spam rule when a form submission is marked as spam. - Handle potential Prosopo connection errors gracefully. = 4.10.2 = _Release date: Feb 28, 2025_ - Fix WPForms parameter type change causing a fatal error if using WPForms with a Mailchimp sign-up field. - Add Mailchimp data to Personal Data exporter. Contributed by [David Anderson from UpdraftPlus](https://updraftplus.com/). - Prevent PHP notices in lists overview on general settings page. = 4.10.1 = _Release date: Feb 06, 2025_ - Fix JS error breaking Ninja Forms edit form page when not connected to a Mailchimp account or account has no audiences. - Remove `sprintf` usage in hot path. - Lazy load `MC4WP_API_V3` class to save some memory and parse time. - Save a tiny bit of memory in autoloader implementation by not repeatedly storing plugin directory. - Remove unused setting key from default options. = 4.10.0 = _Release date: Jan 23, 2025_ - Bump required PHP version to 7.4 or higher. - Obfuscate API key the same way as in the Mailchimp.com interface. - Delete all plugin data when plugin is uninstalled / deleted via WP Admin. - Fix several PHP 8.4 deprecation warnings. - Address warning about translations being loaded too early if using Ninja Forms integration. - Run stored setting values related to user-facing textual messages through i18n functions to allow translating them through plugins like Loco Translate or WPML. = 4.9.21 = _Release date: Jan 08, 2025_ - [Forms] Rename "list choice" to "audience choice" in available form fields. - [Ninja Forms] Fix gettext being called too early warning in Ninja Forms base class. - [WooCommerce] Allow pre-checking of sign-up checkbox in Checkout Block. = 4.9.20 = _Release date: Dec 18, 2024_ - Fix Ninja Forms integration field no longer showing up. - Fix "link is expired" message because of missing nonce on button to dismiss API key notice. - [WPML] Added text_no_lists_selected to the config file so it can be translated. Thanks [Diego Pereira](https://github.com/diiegopereira)! = 4.9.19 = _Release date: Nov 11, 2024_ - Add integration with [Prosopo](https://prosopo.io/), a GDPR compliant anti-spam solution for protecting your sign-up forms against bot sign-ups. Thanks [Maxim Akimov](https://github.com/light-source)! = 4.9.18 = _Release date: Oct 21, 2024_ - Bump required PHP version to 7.2. - Prevent non-functional checkbox from showing up on WooCommerce my account page if WooCommerce checkout integration is enabled. - Update default form content to include a "for" attribute on the label element. - Minor performance optimizations to `MC4WP_Form::get_subscriber_tags()` - Begrudgingly rename Mailchimp lists to Mailchimp audiences throughout the plugin's admin interfaces. = 4.9.17 = _Release date: Sep 17, 2024_ - Fix compatibility with WooCommerce versions 8.5 to 8.8 because of private method that was later made public. - Fix potential reflected XSS by stripping and escaping all HTML from `{email}` tag replacements. Thanks to kauenavarro for responsibly disclosing. - Fix potential stored XSS for attackers with both administrator access and Mailchimp account access by escaping HTML from interest group name. Thanks to Jorge Diaz (ddiax) for responsibly disclosing. = 4.9.16 = _Release date: Sep 11, 2024_ - Add support for WooCommerce Checkout Block in sign-up checkbox integration. = 4.9.15 = _Release date: Aug 13, 2024_ - Improved anti-spam measures on the [custom form integration](https://www.mc4wp.com/kb/subscribe-mailchimp-custom-html-form/). If you are using the custom form integration (using the `mc4wp-subscribe` checkbox), please test your forms after upgrading and report any issues to us. - Improved anti-spam measures on all sign-up forms. - Remove unsupported filter hook from Gravity Forms integration. = 4.9.14 = _Release date: Jul 17, 2024_ - Very minor code-size improvements to public forms related JavaScript. - Update third-party JS dependencies. - Bump tested WordPress version to 6.6. = 4.9.13 = _Release date: Apr 25, 2024_ - Fix issue with Composer classmap throwing a fatal error when an older version of Composer is already loaded. = 4.9.12 = _Release date: Apr 22, 2024 _ - Fix last 10 Mailchimp lists not being pulled-in when having more than 10 lists. = 4.9.11 = _Release date: Jan 8, 2024_ - Update third-party JS dependencies. - Bump tested WordPress version. = 4.9.10 = _Release date: Nov 20, 2023_ - Integrations: Update CheckoutWC hook name for WooCommerce checkbox integration. - Forms: Don't show form preview to users without `edit_posts` capability. - Forms: Explicitly exclude form preview from search engine indexing. - General: Don't unnecessarily go through service contrainer while bootstrapping plugin. - General: Remove some unnecessary JavaScript now that browser support has caught up. = 4.9.9 = _Release date: Oct 3, 2023 _ - Fix class "MC4WP_Usage_Tracking" not found error for WP Cron / WP CLI processes. = 4.9.8 = _Release date: Oct 3, 2023_ - Remove the opt-in usage tracking functionality as we're not really using it for decision making anymore. - Add missing label element to the select element for setting the logging level. - Our JavaScript assets are now transpiled to support the same set of browsers as WordPress core. This drops support for some very old browsers, but results in smaller bundle sizes for the supported set of browsers. - Update third-party JS dependencies to their latest versions. = 4.9.7 = _Release date: Aug 29, 2023_ - Update third-party JS dependencies. - Minor textual improvements. - Bump tested WordPress version. = 4.9.6 = _Release date: Jul 12, 2023_ - Update third-party JS dependencies. - Address some minor codestyle issues. = 4.9.5 = _Release date: Jun 7, 2023_ - Fix generated HTML for list/audience choice fields. - Fix deprecation warning in includes/admin/class-review-notice.php. - Update JavaScript dependencies. = 4.9.4 = _Release date: May 2, 2023_ - Fallback to default checkbox label if none given. Thanks to [Shojib Khan](https://github.com/kshojib). - Improve WooCommerce integration settings page by disabling position field if integration is disabled. Thanks to [Shojib Khan](https://github.com/kshojib). - Update JavaScript dependencies. = 4.9.3 = _Release date: Mar 31, 2023_ - Defend against breaking change in latest WPForms update. = 4.9.2 = _Release date: Mar 21, 2023_ - Add support for a field named `MARKETING_PERMISSIONS` to enable GDPR fields configured in Mailchimp. A [sample code snippet can be found here](https://github.com/ibericode/mailchimp-for-wordpress/blob/main/sample-code-snippets/forms/gdpr-marketing-permissions.md). - Remove Google reCaptcha feature. This was already disabled if you were not already using it. = 4.9.1 = _Release date: Feb 7, 2023_ - Fix generated value attribute for fields of type choice (dropdown, checkboxes, radio fields). - Fix type of `marketing_permissions` field in API requests. Thanks to [George Korakas](https://github.com/gkorakas-eli). - Refactor list overview JS to not depend on Mithril.js anymore. - Simplify admin footer text asking for a plugin review. - When renewing lists, renew cached marketing permissions too. = 4.9.0 = _Release date: Jan 13, 2023 _ - Removed deprecated filter hook `mc4wp_settings_cap`, use `mc4wp_admin_required_capability` instead. - Removed deprecated filter hook `mc4wp_merge_vars`, use `mc4wp_form_data` or `mc4wp_integration_data` instead. - Removed deprecated filter hook `mc4wp_form_merge_vars`, use `mc4wp_form_data` instead. - Removed deprecated filter hook `mc4wp_integration_merge_vars`, use `mc4wp_integration_data` instead. - Removed deprecated filter hook `mc4wp_valid_form_request`, use `mc4wp_form_errors` instead. - Removed deprecated function `mc4wp_get_api()` and deprecated class `MC4WP_API`. - Removed deprecated function `mc4wp_checkbox()`. - Removed deprecated function `mc4wp_form()`, use `mc4wp_show_form()` instead. - Added filter `mc4wp_debug_log_message` to modify or disable messages that are written to the debug log. - Fix color of invalid Mailchimp API key notice. - Sanitize IP address value from `$_SERVER['REMOTE_ADDR']` too. - Fetch GDPR marketing permissions via first subscriber on list and show them in lists overview table. = 4.8.12 = _Release date: Dec 06, 2022_ - Minor performance, memory usage & size optimizations for all JavaScript code bundled with this plugin. = 4.8.11 = _Release date: Nov 1, 2022_ - Improved default styling for the WooCommerce sign-up checkbox integration. - Add `` to allowed HTML elements for GDPR disclaimer text on settings pages. - Remove all references to obsolete placeholders.js polyfill. - Move the GiveWP sign-up checkbox closer to the email input field. Thanks [Matthew Lewis](https://github.com/Matthew-Lewis). = 4.8.10 = _Release date: Sep 14, 2022_ - Fix mc4wp_get_request_ip_address() to return an IP address that matches Mailchimp's validation format when X-Forwarded-For header contains a port component. = 4.8.8 = _Release date: Aug 25, 2022_ - Fix mc4wp_get_request_ip_address() to pass new Mailchimp validation format. This fixes the "This value is not a valid IP." error some users using a proxy may have been seeing. = 4.8.7 = _Release date: Mar 2, 2022_ - Fix PHP 8.1 deprecation warnings in `MC4WP_Container` class. - Fix name of action hook that fires before Mailchimp settings rows are displayed on the settings page. Thanks [LoonSongSoftware](https://github.com/LoonSongSoftware). - Improve WPML compatibility. Thanks [Sumit Singh](https://github.com/5um17). - Fix deprecated function for AMP integration. - Only allow unfiltered HTML if user has `unfiltered_html` capability. Please read the below. Despite extensive testing, we may have missed some more obscure HTML elements or attributes from our whitelist. If you notice that some of your form HTML is stripped after saving your form, please get in touch with our support team and provide the HTML you attempted to save. = 4.8.6 = _Release date: Jun 24, 2021_ - Add nonce field to button for dismissing notice asking for plugin review. - Add strings from config/ directory to POT file. - Add nonce check to AJAX endpoint for refreshing cached Mailchimp lists. - Add capability check to AJAX endpoint for retrieving list details. - Schedule event to refresh cached Mailchimp list upon plugin activation. Thanks to the team over at [pluginvulnerabilities.com](https://www.pluginvulnerabilities.com/) for bringing some of these changes to our attention. = 4.8.5 = _Release date: Jun 1, 2021_ Add nonce verification to all URL's using `_mc4wp_action` query parameter. This fixes a CSRF vulnerability where a malicious website could trick a logged-in admin user in performing unwanted actions. A special thanks to Erwan from [WPScan](https://wpscan.com/) for bringing this issue to our attention. = 4.8.4 = _Release date: May 7, 2021_ - Add `defer` attribute to JS file, so page parsing isn't blocked at all. - Rewrite plugin CSS to optimize for selector performance and get rid of some duplication. After installing this update, make sure to also update any add-on plugins like [Mailchimp for WordPress Premium](https://www.mc4wp.com/premium-features/) and [Mailchimp Top Bar](https://wordpress.org/plugins/mailchimp-top-bar/). = 4.8.3 = _Release date: Jan 21, 2021_ - Fix fatal error on older PHP versions when submitting form without any subscriber tags set in the form settings. - Minor performance improvement in bootstrap method of the plugin. = 4.8.2 = _Release date: Jan 20, 2021_ - Allow short-circuiting `mc4wp_subscriber_data` filter by returning `null` or `false`. - Use a subdirectory for the default debug log file location, so that it's easier to protect using htaccess. - Improved reliability for fetching lists from mailchimp when lists have high stats.member_count property. = 4.8.1 = _Release date: Aug 25, 2020_ - Fix notice by explicitly setting `permission_callback` on registered REST route. - Minor internal code improvements. = 4.8 = _Release date: Jul 9, 2020_ - Plugin now requires PHP 5.3 or higher. - Prefix overlay classname to prevent styling collissions with other plugins. - Form sign-ups can now add tags to both new and existing subscribers. - Update JavaScript dependencies. - Register script early to work with Gutenberg preview. = 4.7.8 = _Release date: Jun 04, 2020_ - Add `MC4WP_API_V3::add_template` method. - Minor code hardening to ensure a default form is always set. - Update JS dependencies to their latest versions. - Fix icon for Gutenberg block. = 4.7.7 = _Release date: Apr 28, 2020_ - Update JS dependencies to their latest versions. - API client `add_list_member` method now has an additional parameter to skip merge field validation. - Simplify code for updating an existing form. = 4.7.6 = _Release date: Apr 9, 2020_ - Update JS dependencies to their latest versions. - Check if className is of type string, fixes a console warning when clicking inside a SVG element. - Minor improvements to the AMP implementation to address harmless validation warnings. = 4.7.5 = _Release date: Feb 10, 2020_ - Add AMP compatibility to sign-up forms, thanks to Claudiu Lodromanean. This uses the [official AMP plugin for WordPress](https://amp-wp.org). - Add settings key to WPML config so settings can easily by copied over to translated versions of a form. - Optimize size & performance of JavaScript code, resulting in a file that is 40% smaller. - Update CodeMirror to its latest version. - Escape all string translations. = 4.7.4 = _Release date: Dec 7, 2019_ **Fixes** - htaccess config for servers running Apache 2.4 or later. = 4.7.3 = _Release date: Dec 4, 2019_ **Fixes** - Top Bar & User Sync add-on using API v2 since version 4.7.1. - Revert change in formatter for date fields, breaking all forms with date fields in them. **Improvements** - Add getter method for raw (unmodified) data on form class. = 4.7.2 = _Release date: Nov 27, 2019_ **Fixes** - Invalid .htaccess file in case there already is one in the uploads directory. = 4.7.1 = _Release date: Nov 26, 2019_ **Improvements** - Update MemberPress hook names. Thanks [Ian Heggaton](https://github.com/pixelated-au)! - Use WordPress.org translations instead of bundling translation files in plugin itself. - Write .htaccess to directory of debug log file, to prevent file access. - Add some convenient hooks for Checkout for WooCommerce. - Stop parsing shortcodes in text widgets as WordPress core does this since version 4.9. = 4.7 = _Release date: Nov 7, 2019_ **Improvements** - Add role=alert to form notices. - Add setting to pre-check sign-up checkbox for Gravity Forms integrations. - Add new position for WooCommerce integration: directly after the billing_email field. - Fix PHP notices for submitting a form and saving a form as an administrator. - Add link to [Koko Analytics plugin](https://wordpress.org/plugins/koko-analytics/). = 4.6.2 = _Release date: Oct 24, 2019_ **Fixes** - Address fields in forms would always be required (even if really optional). **Improvements** - Add proper SVG admin menu icon. - Minor overall performance and memory usage improvements. = 4.6.1 = _Release date: Oct 7, 2019_ **Fixes** - Fixed list cache usage for WPForms, Gravity Forms and Ninja Forms integrations. = 4.6.0 = _Release date: Oct 7, 2019_ **Improvements** - Improved fetch and cache mechanism for retrieving Mailchimp account details, fetching data only when it is required. - Updated [Mithril](https://mithril.js.org/) and [CodeMirror](https://codemirror.net/) dependencies. - Decreased size of `forms.js` from 22KB to 9KB. - No longer requiring jQuery anywhere. - Increase API HTTP request timeout to 15 seconds. Please note that installing this update requires you to also update any add-ons like [Mailchimp Top Bar](https://wordpress.org/plugins/mailchimp-top-bar/) and [Mailchimp for WordPress Premium](https://www.mc4wp.com/premium-features/) (if installed). = 4.5.5 = _Release date: Sep 12, 2019_ **Fixes** - Google reCAPTCHA script was still loading even if no forms have it enabled. = 4.5.4 = _Release date: Sep 11, 2019_ **Improvements** - Removed custom color from menu item for improved accessibility. - Take birthday field format into account when sending data to Mailchimp. - Print Google reCAPTCHA script in footer. **Changes** - Changed plugin name to MC4WP instead of Mailchimp for WordPress. = 4.5.3 = _Release date: July 23, 2019_ **Fixes** - Temporarily switch status of pending subscribers to "unsubscribe" versus deleting susbcriber before re-subscribing. - Deprecation notice for Gravity Forms version 2.4 and higher. **Improvements** - Filter out empty tags when applying tags to new subscribers. - Show all not installed integrations. - Show notice when form doesn't have a Mailchimp list selected to subscribe people to. - Check function existence for compatibility with WordPress 4.7 - Don't submit form when Google reCAPTCHA is enabled but errors. - Update third-party JavaScript dependencies. = 4.5.2 = _Release date: May 8, 2019_ **Improvements** - Accept more truthy values in custom integration for improved compatibility with third-party forms. - Update JavaScript dependencies. - Load Google reCaptcha script in footer (if needed). = 4.5.1 = _Release date: April 8, 2019_ **Additions** - Add sign-up integration for [Give](https://wordpress.org/plugins/give/) - Add sign-up integration for [UltimateMember](https://wordpress.org/plugins/ultimate-member/) **Improvements** - Write to debug log if Google reCAPTCHA secret key is incorrect. - Validate reCAPTCHA keys when savings form settings. - Allow setting an empty "successfully subscribed" message. = 4.5.0 = _Release date: March 27, 2019_ **Additions** - Built-in integration with Google reCAPTCHA to prevent bots from subscribing to your Mailchimp lists. **Improvements** - Minor improvements to the JavaScript that is loaded on admin pages. = 4.4.0 = _Release date: March 1, 2019_ **Fixes** - AffiliateWP integration subscribing the wrong user if affiliate ID differs from user ID. **Improvements** - Renamed "MailChimp" to "Mailchimp" to match Mailchimp's new branding. - More accurate handling of timeouts for accounts with many MailChimp lists. - UX improvements for integrations overview page. - Validate MailChimp API key format when it's entered. - Improved compatibility with Klarna Checkout in the WooCommerce checkout integration. - Bumped required PHP version to 5.3 (soft requirement for now). **Additions** - Added Gutenberg block for easily adding a form to a post or page. - Added subscriber tags setting to forms. = 4.3.3 = _Release date: December 31, 2018_ **Fixes** - Update WPForms integration to properly detect if the WPForms plugin is activated. **Improvements** - Write API request parameters to the debug log in case of connection timeouts. - Update JavaScript dependencies. = 4.3.2 = _Release date: December 11, 2018_ **Fixes** - Use of `readonly` function, which is only available in WordPress 4.9 or later. = 4.3.1 = _Release date: November 28, 2018_ **Fixes** - Fatal error on PHP versions older than 5.5 = 4.3 = _Release date: November 28, 2018_ **Additions** - Added `MC4WP_API_KEY` PHP constant which can be used to set your Mailchimp API key. - Add `mc4wp_mailchimp_list_limit` filter hook to modify the maximum number of Mailchimp lists to fetch. Defaults to 200. **Improvements** - Apply `mc4wp_integration_gravity-forms_options` filter hook on Gravity Forms integration options so the checkbox can be prechecked and the checkbox label text modified. - The `updated_subscriber` JS event is now fired forms not using AJAX as well (when applicable). = 4.2.5 = _Release date: Sep 11, 2018_ **Improvements** - Only re-add subscriber to list if we want to re-trigger a double opt-in confirmation email. - Change Gravity Forms field name to "Mailchimp for WordPress" - Get rid of cached result of Mailchimp API connection. = 4.2.4 = _Release date: July 9, 2018_ **Improvements** - Ensure type-safety on some global variables. - Stop showing trashed forms immediately. - Pre-check Mailchimp list when creating a new form if there is only 1 list. - Send `null` for unknown values in usage tracking data (only when opted-in). **Additions** - Add methods for accessing Mailchimp's e-commerce promo code endpoints to API class. = 4.2.3 = _Release date: June 11, 2018_ **Fixes** - Don't wrap "agree to terms" input in hyperlink element. - Allow [ENTER] key again after field helper overlay is closed. **Improvements** - Fallback to meta-refresh if redirect fails because of "headers already sent" error. = 4.2.2 = _Release date: May 22, 2018_ **Fixes** - Events Manager integration was not working with logged-in users. - Form preview URL should respect admin HTTP(S) scheme. - Removed use of PHP 5.4 function. **Improvements** - Add "agree to terms" checkbox to field helper. **Additions** - Add filter `mc4wp_http_request_args`. = 4.2.1 = _Release date: April 11, 2018_ **Fixes** - Namespace usage warning when running PHP 5.2 **Improvements** - Remove obsolete `type` attribute from all `