How to use /notify call

Hi!

I see a rest api call that I want to use https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issues/#api-rest-api-3-issue-issueidorkey-notify-post, but I have a couple of questions, first, can I send an email to a personality email that is not in an account inside Jira? If it is, how could I do? For example:

{
    "textBody": "TEST.",
    "htmlBody": "TEST.",
    "to": {
        "assignee": true,
        "users": [
            {
                "email":"random@random.com"
            }
        ]
    }
}

The second question is, the property “Additional Properties”, what is it for? And can you show me an example of how to use it, please?

Thanks in advance!

Best Regards,
Pedro.

Regarding your first question, Provided you are using Jira Service Management you should be able to create a new customer with https://developer.atlassian.com/cloud/jira/service-desk/rest/api-group-customer/#api-rest-servicedeskapi-customer-post first or if you are using Software or Business you would need to create a new account first https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-users/#api-rest-api-3-user-post. Then you should be able to a notification to that account. I have not tested this though so no guarantees. I don’t know what the recommended way of using Additional Properties is though, maybe someone else can help you with that