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General updates

• The URLs for the API endpoints are now api.kit.com/v4/... instead of api.convertkit.com/v3/.... They are otherwise unchanged unless called out specifically below.
• V4 supports OAuth for applications and API Keys for automating simple tools and integrations for your personal account. V4 API Keys are not compatiblewith V3
• Our pagination mechanism has changed. We no longer support page or offset based pagination. All of our pagination is now cursor based. This improves performance.
• All errors are now returned with a consistent response shape. The response is a JSON object with a single attribute errors, an array of strings.
• See below for a list of endpoints changed

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Endpoint specific updates

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Accounts

• Get current account
  • The response shape has changed. User and account information is now nested under user and account objects, respectively.

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Broadcasts

• List broadcasts
  • The page parameter is no longer supported. To request next or previous pages, use the before or after cursor
• Create a broadcast
  • The email_layout_template param is no longer supported. To specify the email template, use the email_template_id param.
    • Query your email templates to get the correct id
  • The response shape has changed. We no longer return email_layout_template and return an object for email_template.
  • The error response shape has changed.
• Get a broadcast
  • The response shape has changed. We no longer return email_layout_template and return an object for email_template.
  • The error response shape has changed.
• Delete a broadcast
  • The response shape has changed. We return a 204 empty response.
  • The error response shape has changed.
• Update a broadcast
  • The email_layout_template param is no longer supported. To specify the email template, use the email_template_id param.
    • Query your email templates to get the correct id
  • The response shape has changed. We no longer return email_layout_template and return an object for email_template.
  • The error response shape has changed.
• Get stats
  • The error response shape has changed.

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Subscribers

• List subscribers
  • The page parameter is no longer supported. To request next or previous pages, use the before or after cursor
  • The from parameter is no longer supported. It has been replaced with created_after.
  • The to parameter is no longer supported. It has been replaced with created_before.
  • The updated_from parameter is no longer supported. It has been replaced with updated_after.
  • The updated_to parameter is no longer supported. It has been replaced with updated_before.
• Get a subscriber
  • The error response shape has changed.
• Update a subscriber
  • The error response shape has changed.
• Unsubscribe a subscriber
  • The URL path has changed. /v3/unsubscribe -> /v4/subscribers/:id/unsubscribe
  • We now require you to unsubscribe the subscriber via their id
    • If you need to find their id by email address, you can query with List subscribers, /v4/subscribers?email_address=<email>
  • The response shape has changed. It returns a 204 empty response instead of the subscriber.
  • The error response shape has changed.
• List tags for a subscriber
  • The response shape has changed. created_at has been replaced with tagged_at.
  • The error response shape has changed.

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Custom Fields

• Create a custom field
  • The response shape has changed. The created custom field is now returned nested under a custom_field attribute.
  • This endpoint no longer allows creating multiple custom fields. Use Bulk create custom fields instead.
  • The error response shape has changed.
• Update a custom field
  • The response shape has changed. The updated custom field is returned nested under a custom_field attribute.
  • The error response shape has changed.

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Forms

• List forms
  • The response shape has changed.
• Add subscriber to a form by email address
  • The email parameter is no longer supported. To add a subscriber by email address, use the email_address parameter.
• List subscribers to a form
  • The URL path has changed. /v3/forms/:id/subscriptions -> /v4/forms/:id/subscribers
  • The response shape has changed. Subscriber information is no longer nested under subscription.

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Purchases

• List purchases
  • The page parameter is no longer supported. To request next or previous pages, use the before or after cursor
• Create a purchase
  • The error response shape has changed.

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Sequences

• List sequences
  • The response shape has changed. Sequences are nested under a sequences attributes (instead of a courses attribute).
• Add subscriber to a sequence by email address
  • The email parameter is no longer supported. To add a subscriber by email address, use the email_address parameter.
• List subscribers to a sequence
  • The URL path has changed. /v3/sequences/:id/subscriptions -> /v4/sequences/:id/subscribers
  • The response shape has changed. Subscriber information is no longer nested under subscription.

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Tags

• Create a tag
  • The request shape has changed. Root tag attribute no longer required
  • The response shape has changed. The returned tag is nested under a tag attribute.
  • The error response shape has changed.
  • This endpoint no longer allows creating multiple tags. Use Bulk create tags instead.
• List subscribers for a tag
  • The URL path has changed. /v3/tags/:id/subscriptions -> /v4/tags/:id/subscribers
  • The page parameter is no longer supported. To request next or previous pages, use the before or after cursor
  • The error response shape has changed.
  • The response shape has changed. The root object is subscribers instead of subscriptions along with other smaller changes.
• Tag a subscriber
  • The URL path has changed. /v3/tags/:id/subscribe -> /v4/tags/:tag_id/subscribers/:id
  • The response shape has changed. The root object is subscriber instead of subscription along with other smaller changes.
  • The error response shape has changed.
  • None of the optional params from V3 are supported in V4
• Tag a subscriber by email address
  • The URL path has changed. /v3/tags/:id/subscribe -> /v4/tags/:tag_id/subscribers
  • The email parameter is no longer supported. To add a subscriber by email address, use the email_address parameter.
  • The response shape has changed. The root object is subscriber instead of subscription along with other smaller changes.
  • The error response shape has changed.
  • None of the optional request params from V3 are supported in V4
• Remove tag from subscriber
  • The URL path and HTTP verb has changed. POST /v3/tags/:id/unsubscribe -> DELETE /v4/tags/:tag_id/subscribers/:id
  • The response shape has changed. We return a 204 empty response
  • The error response shape has changed.
• Remove tag from subscriber by email address
  • The URL path and HTTP verb has changed. POST /v3/tags/:id/unsubscribe -> DELETE /v4/tags/:tag_id/subscribers/:id
  • The response shape has changed. We return a 204 empty response.
  • The error response shape has changed.

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Webhooks

• The URL paths for webhooks have changed from /automations/hooks to /webhooks.
• Create a webhook
  • The response shape has changed. The root object is webhook instead of rule.
  • The error response shape has changed.
• Delete a webhook
  • The response shape has changed. We return a 204 empty response.
  • The error response shape has changed.