Zendesk

Zendesk provides comprehensive REST APIs organized by product capabilities including Support API (ticketing), Help Center API, Chat API, Talk API, and Sell CRM API.

Authentication supports API tokens, OAuth 2.0, and Basic Auth with scope-based permissions. Support API offers 300+ endpoints covering tickets, users, organizations, search, incremental exports, webhooks, and custom objects extensively. Rate limits vary by plan (typically 700 requests/minute for Pro+) with High Volume API add-on available. Postman collections available for testing.

Features include idempotency keys for ticket creation, side-loading related records, and bulk operations. SSL-only with TLS 1.2 required. Ideal for customer service automation, help desk integrations, omnichannel support platforms, and building custom ticketing workflows with extensive customization options.