How to update test run custom fields values using xray cloud API ?

[Nivedita N]

I have a requirement to update the test run custom fields value using xray cloud API.

I want to know what will be the request payload for updating custom fields, currently, I am using the below request payload, but it's not working. I have been blocked for this issue for a week, please let me know what should be the request payload.

Getting error as  "error": "Result is not valid Xray Format".

[Saurabh Kumar]

Please help, can custom field be updated at Junit xml report at testsuite block into Jira test execution instance.

For ex - here i listed in bold and it should update the Jira test execution field which corresponds to field customfield_12345

Sampe jira XMl report 

<?xml version='1.0' encoding='UTF-8' ?>
<testsuite name="com.xyz.RegressionTests" tests="40" failures="10" errors="0" skipped="1" time="8152.546" timestamp="2025-03-24T02:59:04" hostname="localhost">
<properties>
<property name="testrun_customfield:customfield_12345" value="Stocks"/>
<property name="device" value="Pixel" />
<property name="flavor" value="" />
<property name="project" value=":app" />
</properties>
<testcase name="verify_HSADetailsAllActivityOnlyPendingTransactionsETEFlow" classname="com.xyz.RegressionTests" time="39.257">

</testcase>
</testsuite>

At this moment when i try with this sample then everything works fine including uploading the test report from junit xml file into test execution instance of Jira with no error 

The only problem remains - the custom field values are not getting updated

i referred this doc to  come up with the approach 

https://docs.getxray.app/display/XRAYCLOUD/Taking+advantage+of+JUnit+XML+reports#TakingadvantageofJUnitXMLreports-Testruncustomfields

Appreciate if any one share more details around to identify the missing pieces