curl --location --request PUT '/rest/api/3/issuesecurityschemes/level/default' \
--header 'Content-Type: application/json' \
--data-raw '{
    "defaultValues": [
        {
            "defaultLevelId": "20000",
            "issueSecuritySchemeId": "10000"
        },
        {
            "defaultLevelId": "30000",
            "issueSecuritySchemeId": "12000"
        }
    ]
}'null