Integrate ConvertKit and WPForms

1. 

   WPForms Kit API Connections at WPForms > Settings > Integrations > Kit

2. 

   WPForms Kit Form Settings when editing a WPForms Form at Marketing > Kit

Does this plugin require a paid service?

No. You must first have an account on kit.com, but you do not have to use a paid plan!

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1.9.1 2026-03-31

• Fix: Downgrade WordPress Libraries to 2.1.3, resolving issues in 1.9.0 and 1.9.0.1

1.9.0.1 2026-03-30

• Fix: Fatal error: Cannot redeclare trait ConvertKit_API\ConvertKit_API_Traits

1.9.0 2026-03-30

• Updated: Use WordPress Libraries 2.1.4

1.8.9 2025-12-18

• Fix: Settings: Automatically delete invalid Access Tokens
• Updated: Use WordPress Libraries 2.1.3

1.8.8 2025-12-03

• Updated: Use WordPress Libraries 2.1.2

1.8.7 2025-11-20

• Updated: Use WordPress Libraries 2.1.1

1.8.6 2025-09-29

• Updated: WordPress Coding Standards for JS and CSS
• Updated: Use WordPress Libraries 2.1.0

1.8.5 2025-07-31

• Fix: Automatically refresh Access Token when expired

1.8.4 2025-05-15

• Added: Form Builder: Marketing: Kit: Add New Connection: Display OAuth popup if no existing connections are specified at WPForms > Settings > Integrations

1.8.3 2025-05-07

• Updated: Require PHP 7.1 or greater
• Updated: Use WordPress Libraries 2.0.9

1.8.2 2025-04-15

• Updated: Use WordPress Libraries 2.0.8

1.8.1 2025-03-25

• Fix: Remove load_plugin_textdomain call, as it’s not needed since WordPress 4.6
• Fix: Issue client ID, site-specific v4 API Access and Refresh Token when upgrading from < 1.7.0
• Updated: Use WordPress Libraries 2.0.7

1.8.0 2025-03-06

• Fix: Save Creator Network settings when editing a WPForms Form in WPForms Lite 1.9.4.0+

1.7.9 2025-01-23

• Added: Populate the referrer property when a WPForms Form is configured to subscribe an email address to a Kit Form
• Updated: ConvertKit WordPress Libraries to 2.0.6

1.7.8 2024-11-13

• Added: OAuth: Issue site-specific Access and Refresh Token when using the same Kit account on multiple WordPress sites
• Added: Settings: Integrations: Add Reconnect option
• Added: Use Kit Account ID as Provider Key, to retain settings when reconnecting via OAuth
• Updated: ConvertKit WordPress Libraries to 2.0.5

1.7.7 2024-10-08

• Fix: Kit branding tweaks and secondary button colors

1.7.6 2024-10-01

• Updated: Changed branding to Kit
• Updated: Kit WordPress Libraries to 2.0.4

1.7.5 2024-09-27

• Updated: ConvertKit WordPress Libraries to 2.0.3

1.7.4 2024-09-13

• Updated: ConvertKit WordPress Libraries to 2.0.2
• Fix: Don’t automatically refresh tokens on non-production sites

1.7.3 2024-08-15

• Fix: Set subscriber to inactive when a ConvertKit Form is specified, honoring the Form’s opt in setting.

1.7.2 2024-08-05

• Added: Option to just subscribe email, or subscribe to a Form, Tag or Sequence

1.7.1 2024-07-18

• Updated: ConvertKit WordPress Libraries to 2.0.1

1.7.0 2024-07-08

• Added: Use ConvertKit v4 API and OAuth
• Updated: ConvertKit WordPress Libraries to 2.0.0

1.6.3 2024-03-08

• Updated: ConvertKit WordPress Libraries to 1.4.2

1.6.2 2024-01-16

• Updated: ConvertKit WordPress Libraries to 1.4.1

1.6.1 2023-11-09

• Updated: ConvertKit WordPress Libraries to 1.4.0

1.6.0 2023-10-05

• Updated: ConvertKit WordPress Libraries to 1.3.9

1.5.9 2023-08-31

• Updated: WordPress Coding Standards
• Updated: ConvertKit WordPress Libraries to 1.3.8

1.5.8 2023-07-24

• Added: Enable Creator Network Recommendations modal on individual Forms at Edit Form > Settings > ConvertKit

1.5.7 2023-07-17

• Updated: ConvertKit WordPress Libraries to 1.3.7

1.5.6 2023-06-13

• Updated: ConvertKit WordPress Libraries to 1.3.6

1.5.5 2023-04-06

• Updated: ConvertKit WordPress Libraries to 1.3.4

1.5.4 2023-03-30

• Added: Tags: Support for multiple tags when tagging a subscriber
• Added: Tags: Support for values as tag names when tagging a subscriber

1.5.3 2023-02-23

• Updated: ConvertKit WordPress Libraries to 1.3.3

1.5.2 2023-02-14

• Updated: ConvertKit WordPress Libraries to 1.3.2

1.5.1.1 2023-02-02

• Fix: WPForms Form > Marketing > ConvertKit: ConvertKit Form: Display Forms in alphabetical order
• Fix: WPForms Form > Marketing > ConvertKit: List Fields: Display Custom Fields in alphabetical order

1.5.0 2023-01-16

• Added: Register ConvertKit as an Integration. API Keys are now defined at WPForms > Settings > Integrations > ConvertKit. Any WPForms Forms from 1.4.2 and earlier will automatically have their ConvertKit API credentials migrated
• Added: Select ConvertKit Form to send entries to from dropdown when editing a WPForms Form at Marketing > ConvertKit, instead of needing to specify a ConvertKit Form ID
• Added: Optionally map a Form Field to be used as the value for tagging a subscriber when editing a WPForms Form at Marketing > ConvertKit. Any WPForms Forms using the ck-tag class are still honored.
• Added: Optionally map Form Fields to be used as a subscriber’s Custom Fields when editing a WPForms Form at Marketing > ConvertKit. Any WPForms Forms using the ck-custom-{name} class are still honored.
• Added: Improved logging at WPForms > Tools > Logs

1.4.2

• Fix: Include name when subscribing to ConvertKit, when the Name field is mapped to the first WPForms Form Field with an ID of zero
• Fix: Include tags when subscribing to ConvertKit
• Fix: Sign up link

1.4.0

• Added support for WPForms Log (Tools > Logs > select provider)

1.3.0

• Added method for defining custom fields and tags in your form, more information

1.2.0

• Added filter for passing custom fields to ConvertKit, see example
• First name is no longer a required field

1.1.0

• Added filter to conditionally limit ConvertKit integration, see example

1.0.3

• Remove ConvertKit link once API key has been provided

1.0.2

• Updated documentation

1.0.1

• Added translation file for localization

1.0.0

• Initial release