# Overview

API v2 answers at your school address, `https://<your school>/api/v2`, on the Cademí subdomain or a custom domain. Release `2.0.0` is the first documented contract of the API that sales partners use to connect gateways to Cademí; it receives fixes only. New integrations should use [API v3](https://cademi.dev/api.md); see [Migrating to v3](https://cademi.dev/legacy/migrating.md).

v2 covers three things: the transactions Cademí received from a gateway, the access entries of a student, and the deliveries that turn a gateway product into access. Field names are in English and IDs are numbers.

A student is identified by `id:<ID>`, `email:<email>` or `doc:<document>` in the `identifier` path parameter. A plain value also works.

See [Authentication](https://cademi.dev/legacy/v2/guides/authentication.md), [Errors](https://cademi.dev/legacy/v2/guides/errors.md) and the [reference](https://cademi.dev/legacy/v2/reference.md).