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The FirstSales Developer API is a versioned public contract under /api/v1. 
https://api.app.firstsales.io/api/v1
Use the endpoint pages for request parameters, generated examples, and response contracts.
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.