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@@ -138,10 +138,11 @@ module ActiveMerchant
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       # * <tt>reference_or_credit_card</tt> The credit card you want to refund OR the datacash_reference for the existing transaction you are refunding
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       # * <tt>options</tt> Are ignored when refunding via reference to an existing transaction, otherwise
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       #   * <tt>:order_id</tt> A unique reference for this order (corresponds to merchantreference in datacash documentation)
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-      #   * <tt>:address</tt>:: billing address for card
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+      #   * <tt>:address</tt> Billing address for card
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+      #   * <tt>:capturemethod</tt> If transaction was originally made with a continuous authority then this MUST be set to 'ecomm' or 'cnp'
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       def credit(money, reference_or_credit_card, options = {})
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         if reference_or_credit_card.is_a?(String)
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-          request = build_transaction_refund_request(money, reference_or_credit_card)
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+          request = build_transaction_refund_request(money, reference_or_credit_card, options)
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         else
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           request = build_refund_request(money, reference_or_credit_card, options)
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         end
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@@ -369,11 +370,12 @@ module ActiveMerchant
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       #     </HistoricTxn> 
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       #     <TxnDetails> 
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       #       <amount>10.00</amount> 
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+      #       <capturemethod>ecomm</capturemethod>
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       #     </TxnDetails> 
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       #   </Transaction>
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       # </Request> 
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       # 
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-      def build_transaction_refund_request(money, reference)
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+      def build_transaction_refund_request(money, reference, options)
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         xml = Builder::XmlMarkup.new :indent => 2
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         xml.instruct!
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         xml.tag! :Request do
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@@ -386,6 +388,9 @@ module ActiveMerchant
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             unless money.nil?
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               xml.tag! :TxnDetails do
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                 xml.tag! :amount, amount(money)
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+                unless options[:capture_method].nil?
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+                  xml.tag! :capturemethod, options[:capture_method]
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+                end
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               end
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             end
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           end

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@@ -267,6 +267,27 @@ class RemoteDataCashTest < Test::Unit::TestCase
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     assert refund.test?
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   end
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+  def test_successful_transaction_refund_for_purchase_made_with_continuous_authority
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+    #Authorize first payment
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+    @params[:set_up_continuous_authority] = true
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+    collect_ca_authorization = @gateway.authorize(@amount, @mastercard, @params)
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+    assert_success collect_ca_authorization
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+    assert !collect_ca_authorization.authorization.to_s.split(';')[2].blank?
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+    assert collect_ca_authorization.test?
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+
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+    purchase_params = { :order_id => generate_unique_id }
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+    purchase = @gateway.purchase(201, collect_ca_authorization.authorization, purchase_params)
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+    assert_success purchase
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+    assert purchase.test?
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+
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+    refund = @gateway.credit(@amount, purchase.params['datacash_reference'], { :capture_method => 'ecomm' })
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+    assert_success refund
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+    assert !refund.params['datacash_reference'].blank?
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+    assert !refund.params['merchantreference'].blank?
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+
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+    assert refund.test?
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+  end
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+
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   def test_successful_transaction_refund_with_money_set_to_nil
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     purchase = @gateway.purchase(@amount, @mastercard, @params)
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     assert_success purchase