Umbraco Heartcore is a software as a service (SaaS) offering, which means that one of the benefits is that you do not have to worry about upgrades. All maintenance related to the CMS, its features and APIs are handled by Umbraco HQ.
Umbraco HQ will regularly be adding new features to the CMS and new capabilities to the REST APIs. Each time new endpoints are added to the REST API the api-version will be updated to reflect the changes. API releases and versioning is handled following the ASP.NET API versioning guidelines.
We follow semver in terms of versioning, which means you can be sure that existing APIs will continue to work as expected without breaking. If a breaking change is required then the major version will be incremented, but the previous major version will continue to work.
{% hint style="info" %}
When making calls to the API, we recommend that you use the api-version header to specify which version of the API you will be using. If no version is specified the latest vesrion of the API will be used.
Learn more about which versions of the API is available as well as what version each endpoint uses in the Umbraco Heartcore API Documentation. {% endhint %}
When using our Client Libraries, the api-version is handled as part of the library and generally not something you need to worry about.
Be aware that the client library releases will have certain features available. As an example, if you are using the very first release (1.0) of the .NET Core client library it will not have the Forms API available. This was made available in the 1.1 version of the client library.