---
title: "January Release - 11.01.2024"
slug: "january-release-11012024"
updated: 2025-10-23T17:52:33Z
published: 2025-10-23T17:52:33Z
canonical: "help.frisbii.com/january-release-11012024"
---

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

# January Release - 11.01.2024

If you are a developer integrating with the Billwerk+ API, then this might be important to you

We are upgrading our API specification from **Swagger 2** to **OpenAPI Specification 3**. OpenAPI 3 brings a host of benefits, including enhanced documentation, improved schema support, and a more comprehensive tooling ecosystem. For details on the OpenAPI Specification see: [https://www.openapis.org/](https://www.openapis.org/)

What does this mean for you?

If you are using the current Swagger specification to inspect the API and/or create code, then you should start using the OpenAPI 3 Specification found at [https://api.reepay.com/openapi.json](https://api.reepay.com/openapi.json) instead of the Swagger 2 specification found at [https://api.reepay.com/swagger.json](https://api.reepay.com/swagger.json). We will continue to serve the legacy specification until April 1 2024, but new API features will not be added to the legacy specification. Notice that Billwerk+ follows an "*open for extension, but closed for modification"* API strategy, so no breaking changes are introduced as long as API integrations ignore unknown attributes.

Feel free to reach out if you have any questions.