I need to fetch the issues for the particular assignee.
You can use something like:
https://bayer.atlassian.net/rest/api/3/search?jql=assignee%3D557058:86e8bf82-f4ed-4018-9b42-f886d45fff0a
Endpoint is documented here even with example - https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-search/#api-rest-api-3-search-get
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