curl --request POST \
  --url https://app.blogbowl.io/api/v1/newsletters \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>"
}
'

{
  "id": 123,
  "name": "<string>",
  "name_slug": "<string>",
  "workspace_id": 123,
  "created_at": "<string>",
  "updated_at": "<string>"
}