REST API, signed webhooks, OAuth 2.0. Pull bookings, push clients, react to lifecycle events from your own systems. Available on Pro.
GET /v1/clients, /v1/services, /v1/staff, /v1/appointments — bearer-token auth with keys you generate from the admin Integrations page. Write endpoints land in the next round.
appointment.created, appointment.cancelled, appointment.rescheduled fire as JSON POST with HMAC-SHA256 signatures. 5-attempt exponential backoff on 5xx; verify signature with the secret you got at creation time.
Build a Zapier/Make-style integration that can be installed across many Appointer tenants. Standard authorization-code flow with refresh tokens.