Update custom field in Zephyr Test Case

Hello Community,

I have a few thousand test cases in the Zephyr Jira plugin. Now I have created some custom fields for the test cases via Zephyr and would like to change the content there.

Unfortunately I can't find in the API description the exact call to change the content of a Zephyr custom field.

I have written a script in Java that fills the content of a Zephyr custom field with a value from about 1000 test cases.

I found this:

https://support.smartbear.com/zephyr-squad-server/docs/api/custom-fields.html#update-custom-field

Unfortunately I can't change the value of the field per test.

Greetings Yvon