def find(id)
      raise ArgumentError.new("Missing id/slug") unless id

      result = access_token.get("#{API_BASE}#{self.class::API_PATH}#{id}")
      raise ServiceError.new(result.code, result.body) unless result.code == "200"

      self.class::ITEM_CLASS.new(result.body)
    end
def find(id)
      raise ArgumentError.new("Missing id/slug") unless id

      result = access_token.get("#{API_BASE}#{self.class::API_PATH}#{id}")
      raise ServiceError.new(result.code, result.body) unless result.code == "200"

      self.class::ITEM_CLASS.new(result.body)
    end
Find an item based on it's id.