Go to Integrations. Paid plans (Spark and above) can use the public API and outbound webhooks. Free plans cannot create API keys (requests return forbidden).
Patterns
Sharity → another app — outbound webhooks when a donation completes, fails, or is refunded
Another app → Sharity — API to read donations/supporters, or POST orders for gifts already paid elsewhere
Guides in the catalog — Salesforce, HubSpot, WordPress/WooCommerce, Zapier, and Custom REST
Start with API keys and Webhooks in the Integrations sidebar, then open the guide that matches your stack.