Native integrations (Rentals United, Channex, Minut, Chekin, Hostaway, etc.). Everything else: REST API, webhooks, or no-code tools via HTTP. No vendor lock-in.
REST API and webhooks (business events) according to your contract; authentication via keys/tokens. No-code automation possible via HTTP (Zapier, Make, etc.).
OTAs, payments, locks — plug everything in, configure once, forget.