Zephyr for Jira Server exposes its data via a REST API which allows you to access the data programmatically and build your own integrations. The API is entirely HTTP-based. You can use the API to:
Integrate with test automation tools.
Integrate with continuous integration tools.
Create extensive custom reports for testing.
Integrate with business intelligence tools.
Use the testing data for other purposes.
For example, you can build an integration that would create a test in a separate tool or system and add it to Zephyr for Jira Server or create a test execution cycle and update the status of a test execution run after it has been executed in an automation tool.
Previously, to access Zephyr for Jira Server REST API, you had to install an additional plugin (ZAPI). As of October 2020, the API is available out-of-the-box, and the ZAPI plugin is no longer needed.