Am writing a java code using jira-rest-api to customise the jira. But am not getting how to pull the story points for each project.
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If you are writing a code as part of a jira plugin - Better use Jira java api:
https://developer.atlassian.com/server/jira/platform/java-apis/
issue.setCustomFieldValue(StoryPoints) //set
issue.getCustomFieldValue(StoryPoints) //get
If we are talking about an external application, here is the description of the documentation for the REST API
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