> ## Documentation Index
> Fetch the complete documentation index at: https://voucherify-pz-test.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Versioning

> What is the latest version?

When we make **backwards-incompatible** changes to the API, we release new, dated versions. The current version is `v2018-08-01`. Read our API [changelog](/docs/api-version-upgrades) to learn more about Voucherify API versions. The changelog lists every available version.

All requests will use the API version listed in your account **Project settings** unless you override the API version.

To set the API version for a specific request, send a `X-Voucherify-API-Version` header.

<CodeGroup>
  ```cURL Example Request
  curl -X GET \
    -H "X-App-Id: c70a6f00-cf91-4756-9df5-47628850002b" \
    -H "X-App-Token: 3266b9f8-e246-4f79-bdf0-833929b1380c" \
    -H "Content-Type: application/json" \
    -H "X-Voucherify-API-Version: v2017-04-20" \
    https://api.voucherify.io/v1/vouchers/VoucherCode
  ```
</CodeGroup>

## API Upgrades

Keep track of changes and [upgrades to the Voucherify API](/docs/api-version-upgrades). If you need help, talk to [support](https://www.voucherify.io/contact-support) or write to us on our [Slack channel](https://www.voucherify.io/community).