# FitProTracker Developer

## Docs

- [contact.created](https://developer.fitprotracker.com/events/contact-created.md): A new contact was added at a location.
- [contact.deleted](https://developer.fitprotracker.com/events/contact-deleted.md): A contact was removed or deactivated at a location.
- [contact.status_changed](https://developer.fitprotracker.com/events/contact-status-changed.md): A contact moved between lifecycle groups (Lead → Member → etc.).
- [contact.sub_group_changed](https://developer.fitprotracker.com/events/contact-sub-group-changed.md): A contact was assigned to a different business sub-group.
- [contact.updated](https://developer.fitprotracker.com/events/contact-updated.md): Any tracked field on an existing contact changed.
- [Event catalog](https://developer.fitprotracker.com/events/overview.md): Every event FitProTracker can deliver, what it means, and when it fires.
- [FitProTracker for developers](https://developer.fitprotracker.com/index.md): Build integrations on top of FitProTracker — starting with real-time webhooks for contact, membership, and payment events.
- [Quickstart](https://developer.fitprotracker.com/quickstart.md): Receive your first FitProTracker webhook in about 10 minutes.
- [Delivery semantics](https://developer.fitprotracker.com/webhooks/delivery.md): At-least-once delivery, idempotency on EventId, retry & backoff, and ordering guarantees.
- [Event envelope](https://developer.fitprotracker.com/webhooks/envelope.md): The shape of every webhook payload FitProTracker sends.
- [Webhooks overview](https://developer.fitprotracker.com/webhooks/overview.md): How FitProTracker delivers real-time events to your application.
- [Signature verification](https://developer.fitprotracker.com/webhooks/signing.md): Verify that webhook requests genuinely come from FitProTracker using HMAC-SHA256.
- [Managing subscriptions](https://developer.fitprotracker.com/webhooks/subscriptions.md): Create, edit, rotate, and delete webhook subscriptions from the FPT admin.
- [Testing your endpoint](https://developer.fitprotracker.com/webhooks/testing.md): Recipes for end-to-end testing without bothering real data.