> ## 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.

# API Versioning

We periodically release new, dated versions of the API whenever we make breaking changes. Although we try to only make backward-compatible changes, sometimes we have to make a breaking change to iterate on the API. In addition to the below, please also reference our [API Changes](/developer-resources/api-changes) page for more details and creating a robust integration.

**We consider the following changes backward compatible**

* Adding new API endpoints
* Adding new optional parameters to existing endpoints
* Adding new data elements to existing responses
* Adding new error types

Our current version is **2020-09-17**

The `Finch-API-Version` header must be set for every single request to our API.