OAuth 1.0 for ServiceDeskAPI (JIRA)

Hello…I’m using AOuth 1.0 for JIRA using Rest API. Getting this error <oauth_problem=signature_method_rejected>. And also sometimes I get another error which is . I have generated the Consumer Key, Access Token, Token Secret with OAuthTutorialClient-1.0.jar. For the Consumer Secret, what is it supposed to be the Consumer Secret ? PS. How/where should I enter the jira_privatekey in postman?