I don’t think I’m being clear, or, I didn’t quite grok that response.
So, I can create a customer request using this api, and I can provide a raiseOnBehalfOf, and provide an email address: https://developer.atlassian.com/cloud/jira/service-desk/rest/#api-rest-servicedeskapi-request-post
But, our app may want to add a comment that the customer made on our app to jira, and we would want it to come from that same user. How can I do a commentOnBehalfOf for that comment?
Keep in mind, the user may or may not have existed when I created the issue - I pass in an email address to
raiseOnBehalfOf, and if the user is not already on service desk, an account will be created for them.