addonKey can make this request.app.connect.key).curl --location --request GET '/rest/atlassian-connect/1/addons//properties'{
    "keys": [
        {
            "self": "https://your-domain.atlassian.net/jira/rest/atlassian-connect/1/addon/example.app.key/properties/propertyKey",
            "key": "propertyKey"
        }
    ]
}