module Exporter
   extend self

   def transfer(params1, params2)
     Services::Transfer.call(params1, params2)
   end

   def get_sender(params1)
     #some_code
   end
 end

module Services
  module Transfer
    def self.call(params1, params2)
      sender = get_sender(params1)
      #some_code
    end
  end
end