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

# Authentication

> Learn how to authenticate your API requests with Zamp.

To access Zamp API endpoints, you must authenticate your requests using bearer token authentication.

## Token Authentication

All API calls require the token to be included in the HTTP `Authorization` header.

```bash theme={null}
curl https://api.zamp.com/transactions \
  -H "Authorization: Bearer {token}"
```

Replace `{token}` with your API token. To obtain a token, you can either:

* Use the [trial environment](/guides/trial) for testing
* [Contact Zamp](https://zamp.com/contact-us/) to request a production API token

<Warning>
  Always keep your token safe and reset it if you suspect it has been compromised.
</Warning>