diff --git a/.github/actions/build-proxies/action.yml b/.github/actions/build-proxies/action.yml
index 728edf4bc..1b3e6d278 100644
--- a/.github/actions/build-proxies/action.yml
+++ b/.github/actions/build-proxies/action.yml
@@ -13,10 +13,10 @@ inputs:
     required: false
     default: false
   environment:
-    description: "Deployment environment"
+    description: "Deployment environment (e.g. main, prNNN)"
     required: true
   apimEnv:
-    description: "APIM environment"
+    description: "APIM environment (e.g. internal-dev, int, ref, prod)"
     required: true
   runId:
     description: "GitHub Actions run ID to fetch the OAS artifact from"
@@ -118,4 +118,5 @@ runs:
           --apimEnvironment "${{ env.APIM_ENV }}" \
           --boundedContext "notify-supplier" \
           --targetDomain "$TARGET_DOMAIN" \
-          --version "${{ inputs.version }}"
+          --version "${{ inputs.version }}" \
+          --internalRef "feature/CCM-15594"
diff --git a/.github/actions/build-sandbox/action.yml b/.github/actions/build-sandbox/action.yml
deleted file mode 100644
index dd4d947e8..000000000
--- a/.github/actions/build-sandbox/action.yml
+++ /dev/null
@@ -1,63 +0,0 @@
-name: "Build Sandbox"
-description: "Build Sandbox"
-inputs:
-  version:
-    description: "Version number"
-    required: true
-
-  NODE_AUTH_TOKEN:
-    description: "Token for access to github package registry"
-    required: true
-runs:
-  using: composite
-
-  steps:
-    - name: Checkout
-      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
-    - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
-      with:
-        node-version: 22
-        registry-url: 'https://npm.pkg.github.com'
-
-    - name: Npm install
-      working-directory: .
-      env:
-        NODE_AUTH_TOKEN: ${{ inputs.NODE_AUTH_TOKEN }}
-      run: npm ci
-      shell: bash
-
-    - name: Install Proxygen client
-      shell: bash
-      run: |
-        # Install proxygen cli
-        pip install pipx
-        pipx install proxygen-cli
-
-        # Setup proxygen auth and settings
-        mkdir -p ${HOME}/.proxygen
-        echo -n $PROXYGEN_PRIVATE_KEY | base64 --decode > ${HOME}/.proxygen/key
-        envsubst < ./.github/proxygen-credentials-template.yaml > ${HOME}/.proxygen/credentials.yaml
-        envsubst < ./.github/proxygen-credentials-template.yaml | cat
-        envsubst < ./.github/proxygen-settings.yaml > ${HOME}/.proxygen/settings.yaml
-        envsubst < ./.github/proxygen-settings.yaml | cat
-
-    - name: Setup Sandbox tag
-      shell: bash
-      run: |
-        if [ -z $PR_NUMBER ]
-        then
-          echo "SANDBOX_TAG=latest" >> $GITHUB_ENV
-        else
-          echo "SANDBOX_TAG=pr$PR_NUMBER" >> $GITHUB_ENV
-        fi
-
-    - name: Build and publish sandbox Docker image
-      shell: bash
-      working-directory: ./sandbox
-      run: |
-          proxygen docker get-login | bash
-          docker build -t nhs-notify-supplier:$SANDBOX_TAG .
-          DOCKER_REGISTRY=$(proxygen docker registry | tail -1)
-          IMAGE_ID=$(docker images -q nhs-notify-supplier:$SANDBOX_TAG)
-          docker tag $IMAGE_ID $DOCKER_REGISTRY/nhs-notify-supplier:$SANDBOX_TAG
-          docker push $DOCKER_REGISTRY/nhs-notify-supplier:$SANDBOX_TAG
diff --git a/.github/proxygen-credentials-template.yaml b/.github/proxygen-credentials-template.yaml
deleted file mode 100644
index e39465bf0..000000000
--- a/.github/proxygen-credentials-template.yaml
+++ /dev/null
@@ -1,4 +0,0 @@
-client_id: $PROXYGEN_CLIENT_ID
-key_id: $PROXYGEN_KID
-private_key_path: key
-base_url: https://identity.prod.api.platform.nhs.uk/realms/api-producers
diff --git a/.github/proxygen-settings.yaml b/.github/proxygen-settings.yaml
deleted file mode 100644
index 8eb364c50..000000000
--- a/.github/proxygen-settings.yaml
+++ /dev/null
@@ -1,2 +0,0 @@
-endpoint_url: https://proxygen.prod.api.platform.nhs.uk
-api: nhs-notify-supplier
diff --git a/.github/workflows/deploy-supplier-api.yaml b/.github/workflows/deploy-supplier-api.yaml
index c7d96d9eb..a01b7454f 100644
--- a/.github/workflows/deploy-supplier-api.yaml
+++ b/.github/workflows/deploy-supplier-api.yaml
@@ -214,7 +214,8 @@ jobs:
             --targetEnvironment "${{ needs.validate.outputs.target_environment }}" \
             --targetAccountGroup "${{ needs.validate.outputs.target_account_group }}" \
             --targetComponent "api" \
-            --terraformAction "apply"
+            --terraformAction "apply" \
+            --internalRef "feature/CCM-15594"
 
   deploy-proxy:
     name: Deploy proxy