SP Online rest api: how to get the "author byline field"?

Question

This gets the name in the "created by" field fine, but for news posts I need the "author byline" field:
https://xxx.sharepoint.com/sites/xxx/_api/web/lists/getbytitle('Site Pages')/items?$select=Title,FileRef,CanvasContent1,Videourl,BannerImageUrl,Author/Title&$expand=Author&$filter=ID eq '193'

The internal field name is "_AuthorByline" but the response is that doesn't exist. Does the field have to be a managed property for the api call to work?
I should add that in a search rest api, "Author" returns the "AuthorByline" field, if populated, "created by" if not..

matt · Answer

Just to close this out-the syntax to get authorbyline for a specific page is:
/_api/web/lists/getbytitle('Site Pages')/items?$select=OData__AuthorByline/Title&$expand=OData__AuthorByline&$filter=ID eq '<pageid>'

Thanks to user92888 for the tip!

user92888 · Answer

You can get to the field using: OData__AuthorBylineId
If you dive into items(id)/properties - you will be able to get the AuthorByline items.
This is a person-field allowing multiple persons.
Also in Flow the Byline field shows on an item.

SP Online rest api: how to get the "author byline field"?

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