> ## Documentation Index
> Fetch the complete documentation index at: https://docs.truckaurbus.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

> Bearer keys, one per app; keys are revocable and suspendable.

Send the key as a bearer token: `Authorization: Bearer tab_live_…` (or `X-Api-Key`). Keys never expire on their own; revoke one on your account page when an app is retired. Up to five active keys per account; an account without a verified mobile number holds one.

Keys belong to the account, and limits count per account: five keys share one quota.

A suspended key answers `403` with the reason; write to [developers@truckaurbus.com](mailto:developers@truckaurbus.com) to discuss it.

## Two different doors

API keys authenticate **your app** reading the catalogue. [Login with Truckaurbus](/guides/login-with-truckaurbus) authenticates **a user** into your app with their truckaurbus identity. They are independent; most integrations use one or the other, some use both.