API reference / Changelog / 2026

API changelog: 2026

Every change to the Kintsugi API in 2026, newest first. For the latest changes and every release, see the API changelog.

All changes Breaking only

Area: Registrations

All areas Addresses Connections Exemptions Filings Imports Nexus Organizations Products Registrations Reports Transactions

Clear filters

Jump to date

2026-09-22

Breaking changes

Requires a request body to deregister a registrationRegistrations

Breaking changeRegistrations

Deregistering now records when and why the registration closes. POST /v1/registrations/{registration_id}/deregister requires a JSON body with closure_date, reason and final_return_acknowledged, so a request with no body, which succeeded before, is now rejected with 422. The 2026-07-21 release changed the same way, with the fields closureDate, reason and finalReturnAcknowledged.

Endpoints

What to do

Send closure_date: the date the registration closes with the jurisdiction, as YYYY-MM-DD. Past and future dates are accepted.
Send reason: FULL_BUSINESS_CLOSURE or CLOSING_NEXUS_IN_STATE.
Send final_return_acknowledged: true, confirming that a final return is still owed.