SecurePayAU: Send order ID for payments with stored cards

As per XML spec (https://auspost.com.au/payments/docs/securepay/resources/API_Card_Storage_and_Scheduled_Payments.pdf )

test/unit/gateways/secure_pay_au_test.rb
24 tests, 106 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed

test/remote/gateways/remote_secure_pay_au_test.rb
18 tests, 57 assertions, 0 failures, 0 errors, 0 pendings, 2 omissions, 0 notifications
100% passed

Co-authored-by: David Cook <david@redcliffs.net>

Author: andypalmer

lib/active_merchant/billing/gateways/secure_pay_au.rb

@@ -204,6 +204,7 @@ def build_periodic_item(action, money, credit_card, options)
         end
         xml.tag! 'amount', amount(money)
         xml.tag! 'periodicType', PERIODIC_TYPES[action] if PERIODIC_TYPES[action]
+        xml.tag! 'transactionReference', options[:order_id] if options[:order_id]
 
         xml.target!
       end

test/remote/gateways/remote_secure_pay_au_test.rb

@@ -21,7 +21,7 @@ def setup
     @credit_card = credit_card('4242424242424242', {month: 9, year: 15})
 
     @options = {
-      order_id: '2',
+      order_id: 'order123',
       billing_address: address,
       description: 'Store Purchase'
     }
@@ -166,6 +166,7 @@ def test_successful_triggered_payment
     assert response = @gateway.purchase(12300, 'test1234', @options)
     assert_success response
     assert_equal response.params['amount'], '12300'
+    assert_equal response.params['ponum'], 'order123'
 
     assert_equal 'Approved', response.message
   end

test/unit/gateways/secure_pay_au_test.rb

@@ -13,7 +13,7 @@ def setup
     @amount = 100
 
     @options = {
-      order_id: '1',
+      order_id: 'order123',
       billing_address: address,
       description: 'Store Purchase'
     }
@@ -79,6 +79,14 @@ def test_purchase_with_stored_id_calls_commit_periodic
     @gateway.purchase(@amount, '123', @options)
   end
 
+  def test_periodic_payment_submits_order_id
+    stub_comms(@gateway, :ssl_request) do
+      @gateway.purchase(@amount, '123', @options)
+    end.check_request do |method, endpoint, data, headers|
+      assert_match(/<transactionReference>order123<\/transactionReference>/, data)
+    end.respond_with(successful_purchase_response)
+  end
+
   def test_purchase_with_creditcard_calls_commit_with_purchase
     @gateway.expects(:commit).with(:purchase, anything)