Downloading Confluence Attachments from 3LO Apps (OAuth 2.0)

Hi,

I managed to call all Confluence APIs using access_token except for downloading attachments from Confluence Pages.

Almost all methods talks about the download link returned from /rest/api/content/${pageId}/child/attachment API. But this _links->download is in the format of /download/attachments/${pageId}/${attName}
and cannot be used with the access token

Is there any API to get the actual download URL (the redirect from the above URL) which is in the format of https://api.media.atlassian.com/file/123/binary?token=${token}&client=${clientId}&name=${attName}

Or how can I construct this URL?