Have a look at the REST API documentation, this one is for JIRA server: https://docs.atlassian.com/jira/REST/server/#api/2/issue-getIssueWorklog
You may also want to checkout the the Developer Community
Here is an article describing the difference between the two communities, https://community.atlassian.com/t5/Feedback-Forum-articles/The-Atlassian-Developer-Community/ba-p/459061
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