Changelog

All changes to the Klantly API, newest first.

Within version 1 things are only added. A change that could break existing integrations only comes in a new version and is announced well in advance with the Deprecation and Sunset headers.

15 September 2026#

Webhooks, deals and more.

• Webhooks following Standard Webhooks: manage endpoints in Klantly and through the API, with signing, retries, a delivery log and a test message. Read the Webhooks guide.
• Events: GET /events to catch up on missed webhooks.
• Deals: list, retrieve, create, update, move, win, lose and archive, and list the pipeline stages.
• Notes on customers and deals.
• The timeline of a customer.
• Retrieve users and company details.
• New scopes: deals.read, deals.write, users.read, company.read, webhooks.manage and events.read.
• New guides: Website form to lead and Make and n8n.

14 September 2026#

First version of the Klantly API.

• Authentication with API keys, with scopes, expiry date, IP allowlist and renewing.
• GET /me to test your connection.
• Customers: list, retrieve, create, update and convert a lead into a customer.
• Cursor pagination, filters, Idempotency-Key and If-Match.
• Error messages according to RFC 9457, in four languages.
• OpenAPI 3.1 specification in four languages.

Last updated on September 15, 2026