I am trying to integrate Postman API with JIRA cloud, please can anyone advise how would I achieve this?
I am not sure what you mean by "Postman API".
Postman usually refers to a tool that you can use to make REST calls to systems, not something that has an API itself. Jira Cloud has a REST API, and to get started with that, have a look at https://developer.atlassian.com/cloud/jira/platform/rest/v3
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