Pin direct message channel

curl --request PUT \
  --url https://api.fluxer.app/v1/users/@me/channels/{channel_id}/pin \
  --header 'Authorization: <api-key>'

{
  "message": "<string>",
  "errors": [
    {
      "path": "<string>",
      "message": "<string>",
      "code": "<string>"
    }
  ]
}