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=== MC4WP: Mailchimp for WordPress ===
Contributors: Ibericode, DvanKooten, hchouhan, lapzor
Donate link: https://www.mc4wp.com/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=donate-link
Tags: mailchimp, mc4wp, email, marketing, newsletter, subscribe, widget, mc4wp, contact form 7, woocommerce, buddypress, ibericode, mailchimp form
Requires at least: 4.6
Tested up to: 5.4
Stable tag: 4.7.7
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Requires PHP: 5.3
Mailchimp for WordPress, the #1 unofficial Mailchimp plugin.
== Description ==
#### Mailchimp for WordPress
*Allowing your visitors to subscribe to your newsletter should be easy. With this plugin, it finally is.*
This plugin helps you grow your Mailchimp lists and write better newsletters through various methods. You can create good looking opt-in forms or integrate with any existing form on your site, like your comment, contact or checkout form.
[youtube https://www.youtube.com/watch?v=fZCYPnFybqU]
#### Some (but not all) features
- Connect with your Mailchimp account in seconds.
- Sign-up forms which are good looking, user-friendly and mobile optimized. You have complete control over the form fields and can send anything you like to Mailchimp.
- Seamless integration with the following plugins:
- Default WordPress Comment Form
- Default WordPress Registration Form
- Contact Form 7
- WooCommerce
- Gravity Forms
- Ninja Forms 3
- WPForms
- BuddyPress
- MemberPress
- Events Manager
- Easy Digital Downloads
- Give
- UltimateMember
- A multitude of available add-on plugins and integrations:
- [Mailchimp for WordPress Premium](https://www.mc4wp.com/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=add-on-list)
- [Mailchimp Top Bar](https://wordpress.org/plugins/mailchimp-top-bar/)
- [Mailchimp Activity](https://wordpress.org/plugins/mc4wp-activity/)
- [Boxzilla Pop-ups](https://wordpress.org/plugins/boxzilla/)
- [Google reCAPTCHA](https://www.google.com/recaptcha/)
- [WPBruiser anti-spam](https://wordpress.org/plugins/goodbye-captcha/)
- Well documented. Our [knowledge base](https://www.mc4wp.com/kb/) is updated daily.
- Developer friendly. For inspiration, check out our [repository of example code snippets](https://github.com/ibericode/mc4wp-snippets).
<blockquote>
<h4>Become a Premium user</h4>
<p>Mailchimp for WordPress has a Premium add-on which comes with several additional benefits.</p>
<ul>
<li>Multiple forms</li>
<li>Advanced e-commerce integration for WooCommerce</li>
<li>Email notifications</li>
<li>An easy way to style your forms</li>
<li>Detailed reports & statistics</li>
</ul>
<p><a href="https://www.mc4wp.com/features/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=after-features-link">View more Premium features</a></p>
</blockquote>
#### What is Mailchimp?
Mailchimp is a newsletter service that allows you to send out email campaigns to a list of email subscribers. It is free for lists up to 2000 subscribers, which is why it is the newsletter-service of choice for thousands of businesses.
This plugin allows you to tightly integrate your WordPress site with your Mailchimp account.
If you are not yet using Mailchimp, [creating an account is 100% free and only takes you about 30 seconds](http://mailchimp.com/monkey-rewards/?utm_source=freemium_newsletter&utm_medium=email&utm_campaign=monkey_rewards&aid=a2d08947dcd3683512ce174c5&afl=1).
== Installation ==
#### Installing the plugin
1. In your WordPress admin panel, go to *Plugins > New Plugin*, search for **Mailchimp for WordPress** and click "*Install now*"
1. Alternatively, download the plugin and upload the contents of `mailchimp-for-wp.zip` to your plugins directory, which usually is `/wp-content/plugins/`.
1. Activate the plugin
1. Set [your API key](https://admin.mailchimp.com/account/api) in the plugin settings.
#### Configuring Sign-Up Form(s)
1. Go to *Mailchimp for WP > Forms*
2. Select at least one list to subscribe people to.
3. *(Optional)* Add more fields to your form.
4. Embed a sign-up form in pages or posts using the `[mc4wp_form]` shortcode.
5. Show a sign-up form in your widget areas using the "Mailchimp Sign-Up Form" widget.
6. Show a sign-up form from your theme files by using the following PHP function.
`
<?php
if( function_exists( 'mc4wp_show_form' ) ) {
mc4wp_show_form();
}
`
#### Need help?
Please take a look at the [Mailchimp for WordPress knowledge base](https://www.mc4wp.com/kb/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=installation-instructions-link) first.
If you can't find an answer there, please look through the [plugin support forums](https://wordpress.org/support/plugin/mailchimp-for-wp) or start your own topic.
== Frequently Asked Questions ==
#### More documentation
More detailed documentation can be found in the [Mailchimp for WordPress knowledge base](https://www.mc4wp.com/kb/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=faq).
#### How to display a form in posts or pages?
Use the `[mc4wp_form]` shortcode.
#### How to display a form in widget areas like the sidebar or footer?
Go to **Appearance > Widgets** and use the **Mailchimp for WP Form** widget that comes with the plugin.
#### Where can I find my API key to connect to Mailchimp?
[You can find your API key here](http://kb.mailchimp.com/accounts/management/about-api-keys#Find-or-Generate-Your-API-Key)
#### How to add a sign-up checkbox to my Contact Form 7 form?
Use the following shortcode in your CF7 form to display a newsletter sign-up checkbox.
`
[mc4wp_checkbox "Subscribe to our newsletter?"]
`
#### The form shows a success message but subscribers are not added to my list(s)?
If the form shows a success message, there is no doubt that the sign-up request succeeded. Mailchimp could have a slight delay sending the confirmation email though, please just be patient and make sure to check your SPAM folder.
When you have double opt-in disabled, new subscribers will be seen as *imports* by Mailchimp. They will not show up in your daily digest emails or statistics. [We always recommend leaving double opt-in enabled](http://blog.mailchimp.com/double-opt-in-vs-single-opt-in-stats/).
#### How can I style the sign-up form?
You can use custom CSS to style the sign-up form if you do not like the themes that come with the plugin. The following selectors can be used to target the various form elements.
`
.mc4wp-form { ... } /* the form element */
.mc4wp-form p { ... } /* form paragraphs */
.mc4wp-form label { ... } /* labels */
.mc4wp-form input { ... } /* input fields */
.mc4wp-form input[type="checkbox"] { ... } /* checkboxes */
.mc4wp-form input[type="submit"] { ... } /* submit button */
.mc4wp-alert { ... } /* success & error messages */
.mc4wp-success { ... } /* success message */
.mc4wp-error { ... } /* error messages */
`
You can add your custom CSS to your theme stylesheet or (easier) by using a plugin like [Simple Custom CSS](https://wordpress.org/plugins/simple-custom-css/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=after-css-link)
#### I'm getting an "HTTP Error" when trying to connect to Mailchimp
If you're getting an `HTTP Error` after entering your API key, please contact your webhost and ask them if they have PHP CURL installed and updated to the latest version (7.58.x). Make sure requests to `https://api.mailchimp.com/` are allowed as well.
#### How do I show a sign-up form in a pop-up?
We recommend the [Boxzilla pop-up plugin](https://wordpress.org/plugins/boxzilla/) for this. You can use the form shortcode in your pop-up box to show a sign-up form.
#### My question is not listed
Please head over to the [Mailchimp for WordPress knowledge base](https://www.mc4wp.com/kb/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=faq) for more detailed documentation.
== Other Notes ==
#### Support
Use the [WordPress.org plugin forums](https://wordpress.org/support/plugin/mailchimp-for-wp) for community support where we try to help all of our users. If you found a bug, please create an issue on Github where we can act upon them more efficiently.
If you're a premium user, please use the email address inside the plugin for support as that will guarantee a faster response time.
Please take a look at the [Mailchimp for WordPress knowledge base](https://www.mc4wp.com/kb/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=description) as well.
#### Add-on plugins
There are several [add-on plugins](https://www.mc4wp.com/add-ons/#utm_source=wp-plugin-repo&utm_medium=mailchimp-for-wp&utm_campaign=description) available, which help you get even more out of your site.
#### Translations
You can [help translate Mailchimp for WordPress into your language](https://translate.wordpress.org/projects/wp-plugins/mailchimp-for-wp/stable/) using your WordPress.org account.
#### Development
This plugin is being developed on GitHub. If you want to collaborate, please look at [ibericode/mailchimp-for-wordpress](https://github.com/ibericode/mailchimp-for-wordpress).
#### Customizing the plugin
The plugin provides various filter & action hooks that allow you to modify or extend default behavior. We're also maintaining a [collection of sample code snippets](https://github.com/ibericode/mc4wp-snippets).
== Screenshots ==
1. Create beautiful sign-up forms that blend in with your theme.
2. Integrate with any other plugin out there.
3. Add a highly converting top bar form to your site.
4. Style your form with our Styles Builder (premium feature).
5. Integrate your WooCommerce store with Mailchimp (premium feature).
6. Dive into detailed sign-up statistics (premium feature).
== Changelog ==
#### 4.7.7 - 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 - 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 - 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 - Dec 7, 2019
**Fixes**
- htaccess config for servers running Apache 2.4 or later.
#### 4.7.3 - 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 - Nov 27, 2019
**Fixes**
- Invalid .htaccess file in case there already is one in the uploads directory.
#### 4.7.1 - 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 - 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 - 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 - Oct 7, 2019
**Fixes**
- Fixed list cache usage for WPForms, Gravity Forms and Ninja Forms integrations.
#### 4.6.0 - 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 - Sep 12, 2019
**Fixes**
- Google reCAPTCHA script was still loading even if no forms have it enabled.
#### 4.5.4 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - December 11, 2018
**Fixes**
- Use of `readonly` function, which is only available in WordPress 4.9 or later.
#### 4.3.1 - November 28, 2018
**Fixes**
- Fatal error on PHP versions older than 5.5
#### 4.3 - 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 - 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 - 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 - 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 - 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 - April 11, 2018
**Fixes**
- Namespace usage warning when running PHP 5.2
**Improvements**
- Remove obsolete `type` attribute from all `<script>` tags printed by the plugin.
- Improved tooltips on settings pages.
- Do not pre-check integration checkboxes by default.
- Add textual warnings to settings that may affect [GDPR compliance](https://www.mc4wp.com/kb/gdpr-compliance/).
- Update translation files.
#### 4.2 - March 5, 2018
**Additions**
- Live form preview while editing form.
**Improvements**
- Improved [conditional fields logic](https://www.mc4wp.com/kb/conditional-fields-elements/).
- Debug log now includes request & response data.
- [Form JavaScript events](https://www.mc4wp.com/kb/javascript-form-events/) are fired in an isolated thread now, to prevent errors in event callbacks from breaking form functionality.
- Don't send empty field values to Mailchimp when updating subscribers.
- Show interest grouping ID in list overview on settings page.
**Fixes**
- Ninja Forms export checkbox would always state "checked" when form contained a Mailchimp sign-up checkbox.
#### 4.1.15 - February 7, 2018
**Fixes**
- Dropdown fields with special characters were not properly passed to Mailchimp.
- Interest groups with an all-numeric ID were not properly passed to Mailchimp.
**Improvements**
- Various minor code optimizations
- Do not redirect when showing "already subscribed" warning.
- Improved scroll to form handling after a form is submitted without AJAX.
#### 4.1.14 - January 8, 2018
**Fixes**
- Validate method was incorrectly checking required array fields.
**Improvements**
- Wrap some missing strings in translate calls. Thanks [morlor](https://github.com/morloi).
- Make it clear that redirecting after successful form submissions will not show the "subscribed" message.
#### 4.1.13 - December 28, 2017
**Fixes**
- Array to string conversion in default form messages.
**Additions**
- Allow marking Gravity Forms sign-up checkbox as a required field.
#### 4.1.12 - December 11, 2017
**Fixes**
- Ninja Forms double opt-in setting was incorrectly inversed.
**Improvements**
- Simplified form processing & notice logic.
- Prevent 404 errors by proactively replacing lowercased `name="name"` input attributes.
- Updated JavaScript dependencies.
**Additions**
- Integration for AffiliateWP.
#### 4.1.11 - November 2, 2017
**Fixes**
- Filter out empty array values when overriding selected Mailchimp lists via `_mc4wp_lists`.
**Improvements**
- Updated JavaScript dependencies.
**Additions**
- Link to the [HTML Forms](https://www.htmlforms.io/) from the plugin settings pages.
#### 4.1.10 - October 19, 2017
**Improvements**
- Remove unused options from Ninja Forms integration.
- Now logging all sign-ups from Ninja Forms integrations when using [Mailchimp for WordPress Premium](https://www.mc4wp.com/premium-features/).
**Additions**
- Added Gravity Forms integration. You can now integrate with Gravity Forms by adding the "Mailchimp" field to your forms.
#### 4.1.9 - September 19, 2017
**Improvements**
- Add `<label>` element to sign-up checkbox for WCAG compatibility.
- Custom integration now works with Enfold theme's contact form element.
#### 4.1.7 & 4.1.8 - September 8, 2017
**Fixes**
- Properly escape the return value of `add_query_arg` when it is used in HTML attributes to prevent cross-site scripting. Thanks to [Karim Ouerghemmi of RIPS](https://www.ripstech.com/) for responsibly disclosing.
- Now loading integrations after WPML so that String Translations work properly.
**Additions**
- Add sign-up integration for WPForms forms.
**Improvements**
- Updated internal JS dependencies.
- Form tag `{data key="foo.bar"}` now allows you to access nested array values.
#### 4.1.6 - July 31, 2017
**Fixes**
- Method on API class for retrieving campaign data.
**Improvements**
- Show Akamai reference number when an API request is blocked by Mailchimp's firewall.
- Minor output buffering improvements in form previewer.
#### 4.1.5 - June 27, 2017
**Fixes**
- Failsafe against outputting sign-up checkbox twice in registration forms.
- Properly close HTML anchor element in French translation files.
- Fix BuddyPress sign-ups when using WordPress Multisite.
**Improvements**
- Fire action hook `mc4wp_form_updated_subscriber` whenever a form was used to update a subscriber in Mailchimp.
- Increase browser timeout for AJAX request when fetching Mailchimp lists.
**Additions**
- Added campaign & template methods to API client class.
#### 4.1.4 - June 15, 2017
**Fixes**
- Some form specific JS events were not firing due to incorrect event names.
- Registration form integration now works with WooCommerce registration form.
- Notice that asks for a plugin review would re-appear after dismissing it.
#### 4.1.3 - May 24, 2017
**Improvements**
- Randomise time of cron event that renews Mailchimp lists.
- Always try to show Mailchimp list info when API key is given.
#### 4.1.2 - May 8, 2017
**Fixes**
- Use earlier hook priority for Ninja Forms 3 integration so action is registered on time.
**Improvements**
- Improved Mailchimp list fetching & memory usage for accounts with many lists.
- Show error message when fetching lists fails.
- Updated plugin translations.
#### 4.1.1 - April 11, 2017
**Fixes**
- WPML String Translation not working with the checkbox label for sign-up integrations.
**Improvements**
- Use updated order methods when using WooCommerce 3.0, thanks to Liam McArthur.
- Updated JavaScript dependencies.
#### 4.1.0 - March 14, 2017
**Improvements**
- Updated all JavaScript dependencies in the plugin.
- Failsafed filter hooks to prevent invalid variable types.
- Explain that greyed out integrations means that specific plugin is not activated.
- Conditional form elements now uses event delegation, so it works with forms in [Boxzilla pop-ups](https://boxzillaplugin.com/).
- Updated language files.
**Additions**
- Added support for Ninja Forms 3.
- Added `mc4wp_integration_show_checkbox` filter.
#### 4.0.13 - February 8, 2017
**Improvements**
- Ensure fields are HTML decoded before sending to Mailchimp.
- Better OptimizePress compatibility.
- Show all address-type fields as required when form contains 1 or more fields of the same address group.
#### 4.0.12 - January 16, 2017
**Fixes**
- Don't call `stripslashes` on POST data twice.
**Improvements**
- Plugin review notice is now dismissible over AJAX.
- Improved formatting of birthday fields.
- Updated Polish translations, thanks to Mateusz Lomber.
- Updated German translations, thanks to Sven de Vries.
**Additions**
- Add `update_ecommerce_store_product` method to API class.
- Throw form specific JavaScript events, like `15.subscribed` to hook into "subscribed" events for form with ID 15.
#### 4.0.11 - December 9, 2016
**Fixes**
- Unescaped request variable on integration settings page, allowing for authenticated XSS. Thanks to [dxwsecurity](https://security.dxw.com/) for responsibly disclosing.
**Improvements**
- Add `$args` parameter to `API::get_lists_activity` method. Relates to the [Mailchimp Activity](https://wordpress.org/plugins/mc4wp-activity/) plugin.
#### 4.0.10 - December 6, 2016
**Improvements**
- You can now enable or disable debug logging from the "Other" settings page.
- No longer using deprecated function in Contact Form 7, thanks to [stodorovic](https://github.com/stodorovic).
- Improved UI for adding hidden interest groupings fields to a form.
#### 4.0.9 - November 23, 2016
**Fixes**
- Issue with escaped HTML when using form tags introduced by previous update.
#### 4.0.8 - November 23, 2016
**Improvements**
- Improved handling of large debug logs.
- Improved error messages when writing exceptions to debug log.
- Show notice when form is missing required Mailchimp fields.
- Custom form integration now handles arrays with 1-level depth. Thanks to [Mardari Igor](https://github.com/GarryOne).
- You can now use nested tags in your form code, eg `{data key="utm_source" default="{current_path}"}`
**Additions**
- Add `data-hide-if` attribute logic to forms. See [conditionally hide form fields](https://www.mc4wp.com/kb/conditional-fields-elements/). Thanks to [Kurt Zenisek](http://kurtzenisek.com/).
- Add hooks for delayed BuddyPress sign-up. Thanks to [Christian Wach](https://profiles.wordpress.org/needle).
#### 4.0.7 - October 25, 2016
**Improvements**
- Obfuscate all email addresses in debug log. Thanks [Sauli Lepola](https://twitter.com/SJLfi).
- Ask for confirmation before disabling double opt-in, which we do not recommend.
- Allow vertical resizing of debug log.
- Failsafe against including JavaScript file twice.
- No longer wrapping CF7 checkbox in paragraph tags.
**Additions**
- Added `mc4wp_form_api_error` action hook for API errors encountered by forms.
- Added `element_class` argument to `[mc4wp_form]` shortcode for adding CSS classes.
#### 4.0.6 - October 10, 2016
**Fixes**
- Issue with lists not showing when using W3 Total Cache with APCu object cache enabled.
**Improvements**
- We're no longer stripping newlines from text fields.
**Additions**
- Added missing e-commerce related API methods to API class.
#### 4.0.5 - September 29, 2016
**Fixes**
- Allow checkbox option for the List Choice field (again).
**Improvements**
- Fetch Mailchimp lists over AJAX, to speed up perceived performance (especially when your account has many lists).
- Periodically fetch Mailchimp lists, so cache is always fresh.
- Improved `<label>` element accessibility for checkbox integrations.
- Stop using double underscore prefix in function names, as these are reserved in PHP 7.
- `{post}` and `{user}` shortcodes now accept a `default` parameter.
**Additions**
- Add [MemberPress](https://www.memberpress.com/) integration.
- Add missing e-commerce related API methods for next week's [WooCommerce Mailchimp e-commerce integration](https://www.mc4wp.com/kb/what-is-ecommerce/) release.
#### 4.0.4 - September 7, 2016
**Improvements**
- Allow re-running previous migrations by visiting a certain admin URL.
- Do not show checkboxes option for fields that only accept a single value.
- Write field specific errors to debug log when Mailchimp denies a sign-up request.
- Write to debug log when custom integrations can not find an EMAIL field.
- Differentiate between connection & authorization errors when testing connection to Mailchimp.
- Bump limit of number of Mailchimp lists to fetch from 100 to 500.
#### 4.0.3 - August 24, 2016
**Fixes**
- Ninja Forms integration not working when using PayPal integration.
**Improvements**
- Show connection errors on Mailchimp settings page.
**Additions**
- Add pre-checked option to Ninja Forms integration.
- You can now [conditionally hide fields or elements](https://www.mc4wp.com/kb/conditional-fields-elements/) using the `data-show-if` attribute.
#### 4.0.2 - August 10, 2016
**Fixes**
- Hidden fields which referenced interest groups by name were not sent to Mailchimp.
- Adding hidden field to form would reset value on every change.
**Improvements**
- Decrease file size of JavaScript for forms by about 30%.
#### 4.0 & 4.0.1 - August 9, 2016
This release updates the plugin to version 3 of the Mailchimp API. Please [read through the upgrade guide](https://www.mc4wp.com/kb/upgrading-to-4-0/) before updating to make sure things keep working as expected for you.
**Changes**
- "Send welcome email" is now handled from your list settings in Mailchimp.
- Filter `mc4wp_form_merge_vars` is now called `mc4wp_form_data`.
- Filter `mc4wp_integration_merge_vars` is now called `mc4wp_integration_data`.
- New format for GROUPING fields in forms & filter hooks.
- Value delimiter in hidden fields is now a pipe `|` character.
**Additions**
- New filter: `mc4wp_form_subscriber_data`.
- New filter: `mc4wp_integration_subscriber_data`.
- New form tag: `{cookie name="mycookie"}`
**Improvements**
- The plugin now communicates with the latest & greatest Mailchimp API.
- Previously unsubscribed subscribers can now be re-added without errors.
- Add `User-Agent` header to all API requests.
- Available fields in form editor are now split-up by category.
- Birthday fields now accept a broader range of values and delimiters.
**Fixes**
- Issue with only 10 Mailchimp lists / fields / interests being returned.
- Incorrect form message showing when double opt-in is disabled.
- Error in upgrade routine when API request fails.
- List fields not fetched when list has just 1 non-default merge field.
#### 3.1.12 - July 28, 2016
**Improvements**
- Smarter scrolling after submitting form & reloading page.
- Format output of `{subscriber_count}` tag.
- You can now use `<img>` in your form messages.
- Add Mailchimp API error code to debug log lines.
- Add plugin name + version to User-Agent header for all Mailchimp API requests.
- Make sure value of MC_LANGUAGE field is limited to 2 characters.
#### 3.1.11 - July 5, 2016
**Improvements**
- Update JavaScript dependencies for admin screens.
- Test debug log & show notice when it's not writable.
**Additions**
- Add "placeholder" option for dropdown fields.
#### 3.1.10 - June 21, 2016
**Fixes**
- Styles Builder in Premium not building because of incorrect flag in core plugin.
**Improvements**
- Don't show position option for WooCommerce integration when sign-up is implicit.
- Improvements to form previewer logic.
- Make sure admin notifications are always shown exactly one time.
#### 3.1.9 - June 7, 2016
**Fixes**
- Placeholder polyfill wasn't loaded (only in IE8 and below).
**Improvements**
- Don't write to debug log if it is not writable.
- Reset some CSS properties for commonly used class names in Form Editor & Debug Log.
- Do not unnecessarily register styles which are then immediately enqueued.
**Additions**
- Add "is required field" option for dropdown & radio fields in Field Helper.
- Link to [Boxzilla plugin](https://boxzillaplugin.com/) from admin sidebar.
#### 3.1.8 - May 23, 2016
**Fixes**
- Form Preview mode replaced all titles on that page with "Form Preview".
- API class fix for [eCommerce360 functionality](https://www.mc4wp.com/kb/what-is-ecommerce/).
**Improvements**
- Show dismissible notice when API key is not set.
- Show empty API key errors in plugin log.
- Friendlier error message for re-subscribe failures.
**Additions**
- Add `form.reset()` method to JS API.
#### 3.1.7 - May 9, 2016
**Fixes**
- Shortcode wasn't accepting `element_id` as a valid attribute.
- Take array style fields into account when checking if a form contains a given field.
**Improvements**
- Nested fields will now be properly validated when they're marked as required.
- If plugin is installed using Composer, autoloader won't be loaded (again).
#### 3.1.6 - April 12, 2016
**Fixes**