    # File lib/active_merchant/billing/gateways/efsnet.rb, line 54
          def void(identification, options = {})
            requires!(options, :order_id)
            original_transaction_id, original_transaction_amount = identification.split(";")
            commit(:void_transaction, {:reference_number => format_reference_number(options[:order_id]), :transaction_ID => original_transaction_id})
          end