diff --git a/proxies/live/apiproxy/targets/target.xml b/proxies/live/apiproxy/targets/target.xml
index c9c0bfdd3..2fe629d5a 100644
--- a/proxies/live/apiproxy/targets/target.xml
+++ b/proxies/live/apiproxy/targets/target.xml
@@ -18,10 +18,14 @@
         <SSLInfo>
             <Enabled>true</Enabled>
         </SSLInfo>
-        <LoadBalancer>
-            <Server name="{{ TARGET_SERVER_OVERRIDE | default('communications-manager-target') }}"/>
-        </LoadBalancer>
-        <Path>{requestpath}</Path>
+        {% if ENVIRONMENT_TYPE == 'sandbox' %}
+            <LoadBalancer>
+                <Server name="{{ TARGET_SERVER_OVERRIDE | default('communications-manager-target') }}"/>
+            </LoadBalancer>
+            <Path>{requestpath}</Path>
+        {% else %}
+            <URL>https://comms-apim.de-rake4.communications.national.nhs.uk</URL>
+        {% endif %}
         <Properties>
             <Property name="io.timeout.millis">29000</Property>
         </Properties>
diff --git a/proxies/shared/policies/AssignMessage.MessageBatches.Create.Request.xml b/proxies/shared/policies/AssignMessage.MessageBatches.Create.Request.xml
index 3dfbc673b..a269ec338 100644
--- a/proxies/shared/policies/AssignMessage.MessageBatches.Create.Request.xml
+++ b/proxies/shared/policies/AssignMessage.MessageBatches.Create.Request.xml
@@ -16,10 +16,17 @@
         <Name>target.copy.pathsuffix</Name>
         <Value>false</Value>
     </AssignVariable>
-    <AssignVariable>
-        <Name>requestpath</Name>
-        <Value>/api/v1/send</Value>
-    </AssignVariable>
+    {% if ENVIRONMENT_TYPE == 'sandbox' %}
+       <AssignVariable>
+           <Name>requestpath</Name>
+           <Value>/api/v1/send</Value>
+       </AssignVariable>
+    {% else %}
+        <AssignVariable>
+            <Name>target.url</Name>
+            <Value>https://comms-apim.de-rake4.communications.national.nhs.uk/api/v1/send</Value>
+        </AssignVariable>
+    {% endif %}
     <Set>
         <Payload contentType="application/json" variablePrefix="%" variableSuffix="#">%data.payload#</Payload>
         <Headers>
diff --git a/proxies/shared/policies/AssignMessage.Messages.Create.Request.xml b/proxies/shared/policies/AssignMessage.Messages.Create.Request.xml
index 2a8e9cd5c..8344269f8 100644
--- a/proxies/shared/policies/AssignMessage.Messages.Create.Request.xml
+++ b/proxies/shared/policies/AssignMessage.Messages.Create.Request.xml
@@ -16,10 +16,17 @@
         <Name>target.copy.pathsuffix</Name>
         <Value>false</Value>
     </AssignVariable>
-    <AssignVariable>
-        <Name>requestpath</Name>
-        <Value>/api/v1/messages</Value>
-    </AssignVariable>
+    {% if ENVIRONMENT_TYPE == 'sandbox' %}
+       <AssignVariable>
+           <Name>requestpath</Name>
+           <Value>/api/v1/messages</Value>
+       </AssignVariable>
+    {% else %}
+        <AssignVariable>
+            <Name>target.url</Name>
+            <Value>https://comms-apim.de-rake4.communications.national.nhs.uk/api/v1/messages</Value>
+        </AssignVariable>
+    {% endif %}
     <Set>
         <Payload contentType="application/json" variablePrefix="%" variableSuffix="#">%data.payload#</Payload>
         <Headers>
diff --git a/proxies/shared/policies/AssignMessage.Messages.GetSingle.Request.xml b/proxies/shared/policies/AssignMessage.Messages.GetSingle.Request.xml
index ce54ec959..da2298f8c 100644
--- a/proxies/shared/policies/AssignMessage.Messages.GetSingle.Request.xml
+++ b/proxies/shared/policies/AssignMessage.Messages.GetSingle.Request.xml
@@ -16,10 +16,17 @@
         <Name>target.copy.pathsuffix</Name>
         <Value>false</Value>
     </AssignVariable>
-    <AssignVariable>
-        <Name>requestpath</Name>
-        <Template>/api/v1/messages/{data.messageId}</Template>
-    </AssignVariable>
+    {% if ENVIRONMENT_TYPE == 'sandbox' %}
+       <AssignVariable>
+           <Name>requestpath</Name>
+           <Template>/api/v1/messages/{data.messageId}</Template>
+       </AssignVariable>
+    {% else %}
+        <AssignVariable>
+            <Name>target.url</Name>
+            <Value>https://comms-apim.de-rake4.communications.national.nhs.uk/api/v1/messages/{data.messageId}</Value>
+        </AssignVariable>
+    {% endif %}
     <Set>
         <Headers>
             <Header name="X-Correlation-Id">{backendCorrelationId}</Header>
diff --git a/proxies/shared/policies/AssignMessage.NhsAppAccounts.Get.Request.xml b/proxies/shared/policies/AssignMessage.NhsAppAccounts.Get.Request.xml
index 6d71f721a..ee362d0b9 100644
--- a/proxies/shared/policies/AssignMessage.NhsAppAccounts.Get.Request.xml
+++ b/proxies/shared/policies/AssignMessage.NhsAppAccounts.Get.Request.xml
@@ -16,10 +16,17 @@
         <Name>target.copy.pathsuffix</Name>
         <Value>false</Value>
     </AssignVariable>
-    <AssignVariable>
-        <Name>requestpath</Name>
-        <Value>/api/channels/nhsapp/accounts</Value>
-    </AssignVariable>
+    {% if ENVIRONMENT_TYPE == 'sandbox' %}
+       <AssignVariable>
+           <Name>requestpath</Name>
+           <Value>/api/channels/nhsapp/accounts</Value>
+       </AssignVariable>
+    {% else %}
+        <AssignVariable>
+            <Name>target.url</Name>
+            <Value>https://comms-apim.de-rake4.communications.national.nhs.uk/api/channels/nhsapp/accounts</Value>
+        </AssignVariable>
+    {% endif %}
     <Set>
         <Headers>
             <Header name="X-Correlation-Id">{backendCorrelationId}</Header>
diff --git a/specification/schemas/components/Message.yaml b/specification/schemas/components/Message.yaml
index 5414b8fa5..432b7a3ed 100644
--- a/specification/schemas/components/Message.yaml
+++ b/specification/schemas/components/Message.yaml
@@ -7,6 +7,8 @@ properties:
     description: This reference needs to be unique per message within this batch. If there are duplicate values then a 400 exception will be thrown highlighting the values that have been duplicated.
     format: uuid
     example: 703b8008-545d-4a04-bb90-1f2946ce1575
+  billingReference:
+    $ref: ../../snippets/BillingReferenceSnippet.yaml
   recipient:
     $ref: Recipient.yaml
   originator:
diff --git a/specification/schemas/requests/CreateMessage.yaml b/specification/schemas/requests/CreateMessage.yaml
index 3c724bc95..32cade016 100644
--- a/specification/schemas/requests/CreateMessage.yaml
+++ b/specification/schemas/requests/CreateMessage.yaml
@@ -31,6 +31,8 @@ properties:
 
               This value is used internally to de-duplicate messages. If you send the same value through multiple times only one of the requests will be actioned.
             example: da0b1495-c7cb-468c-9d81-07dee089d728
+          billingReference:
+            $ref: ../../snippets/BillingReferenceSnippet.yaml
           recipient:
             $ref: ../components/Recipient.yaml
           originator:
diff --git a/specification/snippets/BillingReferenceSnippet.yaml b/specification/snippets/BillingReferenceSnippet.yaml
new file mode 100644
index 000000000..9af3f3f6d
--- /dev/null
+++ b/specification/snippets/BillingReferenceSnippet.yaml
@@ -0,0 +1,3 @@
+type: string
+description: Optional reference for billing purposes. Can be any string.
+example: billing-ref-1
\ No newline at end of file