Changelog

v1 · October 12, 2026

• Server events API: POST /api/v1/events, sk_live_… secret keys, idempotency by event_id.
• Script: firstmrr.visitorId(), to tie a server event to its visitor.
• A/B tests: firstmrr.variant(), the ab:exposure event and the fm_variant key.
• Tracked links: a link can track an account, a format or a label of your own.