Updading status of a test execution (On Jira, zephyr)

[Sarangadhar.Sahani]

https://prod-api.zephyr4jiracloud.com/connect/public/rest/api/1.0/execution/<>?projectId=<>&issueId=<>&_=<some-random-number>

When I execute the above request I get the following error:

{"error":"API not found."}

When I try to retrieve the request details by performing update status operation from Jira page (through F12). i get the above POST request.

Can someone please advice and also let me know how to get this random number? Basically the last parameter of the request.