> ## Documentation Index
> Fetch the complete documentation index at: https://developer.tryfinch.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Headers
## Request Headers
Every request to Finch's API requires the following headers—
| Header | Description |
| ------------------- | ---------------------------------------------------------------------------------------------------------------------------- |
| `Authorization` | Bearer authorization header, which is formed by concatenating the word “Bearer” with the access token, separated by a space. |
| `Finch-API-Version` | Header used to specify the version for a given API request. Current version is **2020-09-17**. |
***
## Response Headers
Finch's additional response headers provide information about the data contained in responses.
| Header | Description |
| ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `Finch-Request-Id` | Each response from Finch's API has a unique request identifier. If you need to contact us about a specific request, providing the request identifier will ensure the fastest possible resolution. |
| `Finch-Data-Retrieved` | The date/time in ISO-8601 format that the data was retrieved from the employment system. |
| `Finch-Last-Attempted-Update-Date` | The date/time in ISO-8601 format that Finch last attempted to update this data. |
| `Finch-Last-Attempted-Update-Result` | The result of Finch's last attempted update. Possible values:
`success`: the last attempt succeeded
`error`: the last attempt errored
`partial_error`: (batch requests only) the last attempt succeeded for some items in the batch and failed for others. |