Mark Agent Messages as Read
PUT https://api.helpshift.com/v1/{{domain}}/chat/issues/{{issue_id}}/messages-seen
Mark all agent messages added to this issue as read, to indicate that the end-user has read the agent's messages
The user must be the original author of the issue.
Request Body
[{"name"=>"identifier", "value"=>"{{user.identifier}}", "datatype"=>"string"}]