Since you mentioned OAuth 1.0, I'm guessing you're using Jira Server. For users that have Jira Cloud, I found that Sam Ogden's post on https://community.atlassian.com/t5/Jira-questions/Using-Jira-API-from-Postman-via-OAuth/qaq-p/704668 appears to have a method to make Postman work with Jira Cloud using OAuth 2.0.
For your use case here with OAuth 1.0, I think you're going to need to start by creating an application link as described in https://developer.atlassian.com/server/jira/platform/oauth/
This guide also has a number of other steps you would need to generate the token correct first, typically using the OAuthTutorialClient-1.0.jar from that tutorial. I would recommend trying to complete that tutorial first. If you can create a REST API call successfully via calling java in the command line and using that access token, then you should be able to take that info on to the next steps in using Postman.
In my searching I came across a similar post from stack overflow were Harshad appears to have found the settings needed to make this work. Please see https://stackoverflow.com/questions/39574851/getting-a-jira-issue-via-oauth-authentication-using-postman for reference. This person found that they could then just pass the access_token as a parameter in the URL directly.
I hope this helps.
Reviewing this question form last year, I'm not sure it is possible to do this using OAuth 1.0a via Postman for Jira Server. There is a guide for using OAuth 1.0a with Jira Server over in https://developer.atlassian.com/server/jira/platform/oauth/
However it has the expectation that this integration is done within a programming language such as Java, however it notes there are samples of how to get this to work with other languages:
If you prefer to figure things out from the source code, feel free to check the output of this tutorial on Bitbucket (look for the
javadirectory). Note, there are examples in that repository for other languages including Node.js, PHP, Python, Perl, and Ruby.
But I don't have sufficient knowledge of how Postman works, such as what language it is written in, or if it could somehow accommodate the handshake required to make this work like a program language could. The guide we have for using OAuth 1.0a with Jira Server is expecting that you are creating your own program or plugin written in the language of your choosing. Not exactly helpful for an existing program like Postman, where we are all unlikely to have control of the source code.
Perhaps you could use a different authentication method here. Basic auth is one way to do this, but I understand that users are resistant to using their password in such a means to authenticate. For Jira Cloud we have a native API token service to try to help fill this gap. Jira Server doesn't have this natively. There are a few different solutions though that provide these API tokens such as
Technically these are not as secure as OAuth, but they are considerably easier to setup and implement, and don't require you to use your password for making such REST API calls to Jira.
Strangely the repository officially mentioned in the JIRA docs does not work at all. I clonned the bitbucket repo and tried python code and it didn't work and same goes for node JS. Only working model is java code. It would be appreciated if someone told me why it is not working for python
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