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## Step-by-step API token guide on the Authentication API page

The [Authentication API](/developer/api-reference/rest/authentication-api) landing page now walks through the full token flow instead of linking straight to the endpoint reference.

* **Three steps with examples** — request a 2FA token, exchange it for an API token, and send the token in the `x-api-key` header, each with a `curl` request and the expected response.
* **Which APIs use the token** — the page lists the APIs that accept the `x-api-key` token and points FeedAMP Order API users to their separate token endpoint.
* **Clearer endpoint reference** — the `POST /login` request fields now say which step they belong to, and the error response is now documented as `400` with an example. Earlier docs listed it as `401`, which the endpoint doesn't return.