curl --request GET \
  --url https://api.wsapi.chat/newsletters/{id} \
  --header 'X-Api-Key: <api-key>' \
  --header 'X-Instance-Id: <x-instance-id>'

{
  "id": "<string>",
  "name": "<string>",
  "description": "<string>",
  "subscriberCount": 123,
  "verificationState": "<string>",
  "pictureUrl": "<string>",
  "inviteCode": "<string>",
  "role": "<string>",
  "mute": "<string>",
  "state": "<string>",
  "createdAt": "2023-11-07T05:31:56Z"
}