The FirstSales Developer API is a versioned public contract under /api/v1.
Use the endpoint pages for request parameters, generated examples, and response contracts.
Authentication is operation-specific. Where declared, Developer API operations use Developer API key bearer tokens. Endpoints marked bearerAuth retain the legacy-compatible bearer scheme. Product MCP OAuth grants apply only to /mcp; the OpenAPI oauthBearer scheme remains reserved for future public OAuth operations.
Only endpoints shown in this API Reference are public. App-private routes, provider callbacks, tracking pixels, unsubscribe handlers, support/admin routes, and internal cron routes are not supported for Developer API clients.
