Zephyr Enterprise exposes its data via a REST API. You can use the API to:

Import tests from other tools into Zephyr.
Integrate Zephyr with other applications.
Get information about users, projects, releases, test case repositories and the underlying folders, test cases, custom fields, execution cycles.
Create new test case folders, test cases, requirements, execution cycles, execution phases.
Add/modify/delete attachments and phases to existing execution cycles.
Assign test execution schedules.
Update test cases and test case execution status.
Create an execution cycle and update the status of a test case execution run.
And more.

API documentation

Zephyr Enterprise 6.7