Returns a media's captions in the specified language.
Supports multiple formats: JSON (default), SRT, VTT, and TXT.
Use file extensions (.srt, .vtt, .txt) or Accept headers to specify format.

Requires api token with one of the following permissions

Read all folder and media data

Tokens with the "Act with a team member's permissions" permission
(all:delegate_to_contact_permissions scope) can also be used. Requests
made with such a token are authorized using the permissions of the
contact assigned to the token.

An expiring access token
created with the all:delegate_to_contact_permissions scope and an
authorization granting the edit-transcripts permission on this media can
also be used. For a token granted any other permission on the media the
captions are not found.