The developer page of a SaaS: API keys with environment, scopes, last use and expiry, created through a form whose secret is shown once (copy it before you can leave), rotated with an overlap or revoked; and webhook endpoints with their recent deliveries as a status strip, opened in a side panel to switch on or off, send a test event, read each delivery's request and response, and resend it. (Beamline complete system)