Hi Gopi,
For Creating issue with HTml Link, you don't need Issue Key , you will require Project Id & Issue type ID.
For Project ID: Click on the required project & on the right hand side you will find Edit Project button, just hover your mouse on this button & in the browser at bottom left , you will see pid=xxxxx.
for IssueType ID: In Admin Section, Click IssueTypes & for any issuetype hover your cursor on Edit button.
-Kapil
you have a option to get issue key if issue created by using REST, check this doc
https://docs.atlassian.com/jira/REST/latest/#idp1607440
it will return response as below so you can get issue key
{ "id": "10000", "key": "TST-24", "self": "http://www.example.com/jira/rest/api/2/issue/10000" }
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