You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: retriever.rb
    path of file: ./repos/vets-api/modules/ask_va_api/app/lib/ask_va_api/inquiries
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module AskVAApi
  module Inquiries
  
    
      def fetch_by_id(id:)
        validate_input(id, 'Invalid ID')
        reply = Correspondences::Retriever.new(inquiry_id: id, service:).call
        data = fetch_data(payload: { id: })
        return {} if data.blank?

        Entity.new(data, reply)
      rescue => e
        ErrorHandler.handle_service_error(e)
      end