---
title: "Public API v2 migration guide and deprecation timeline - Sign Customiser Changelog"
description: "Changelog: Public API v2 migration guide and deprecation timeline. Learn about the latest updates and improvements to Sign Customiser."
url: "https://www.signcustomiser.com/changelog/public-api-v2-deprecation-and-migration-guide/"
last_updated: "2026-09-03"
---

Sign Customiser’s previous-generation public API is now deprecated. Existing integrations continue to work, but developers should move to API v3 before the scheduled 22 January 2027 Sunset.

The new [v2 to v3 migration guide](/help/api/guides/migration-v2-to-v3/) maps every previous-generation operation to its v3 replacement. It also covers scoped Store-bound keys, pricing field changes, webhook subscriptions, order and product writes, error handling, pagination, and a safe cutover sequence that avoids duplicate writes.

Deprecated responses now include standard `Deprecation`, `Sunset`, and `Link` headers. These make the timeline and migration guide visible to API clients without changing existing response bodies, status codes, validation, or authentication behaviour.

## Sitemap

See the full [sitemap](/sitemap.md) for all pages.