I want to know where to find Sentry API endpoints for internal reporting, forwarding data to other services, creating resources such as alerts or teams, or other work that needs an API.

Start with the Sentry API Reference. The sidebar groups endpoints by product area - organizations, teams, projects, events, alerts, and more.

Call the API with a bearer auth token and the scopes that endpoint needs. See Authentication. If your org is in a specific data region, use that host (for example us.sentry.io or de.sentry.io) when the endpoint supports it.