Sent Integration Starter Bring up a Sent integration in four stages: authenticate, send idempotently, receive verified events, then harden. Do not conflate them — most broken integrations pass stage one and skip stage three. Stage 1: client and credentials Direct Sent v3 REST requests authenticate with the header. An application proxy may accept from its own callers, and the Sent MCP server uses client-managed OAuth, but neither changes the REST header sent to . Organization keys may add to act for a child profile; a profile-scoped key that sends that header receives . | Language | Package |…