Please visit the below articles maybe it will help you..
https://developer.atlassian.com/cloud/jira/platform/jira-rest-api-oauth-authentication/
https://developer.atlassian.com/cloud/jira/platform/jira-rest-api-basic-authentication/
https://developer.atlassian.com/cloud/jira/platform/jira-rest-api-cookie-based-authentication/
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