MAGETWO-55395: Custom address attribute not appearing on Checkout summary

Author: le0n4eg

app/code/Magento/Checkout/view/frontend/web/template/billing-address/details.html

@@ -13,6 +13,11 @@
     <!-- ko if: (currentBillingAddress().telephone) -->
     <a data-bind="text: currentBillingAddress().telephone, attr: {'href': 'tel:' + currentBillingAddress().telephone}"></a>
     <!-- /ko --><br/>
+    <!-- ko foreach: { data: currentBillingAddress().customAttributes, as: 'element' } -->
+        <!-- ko foreach: { data: Object.keys(element), as: 'attribute' } -->
+            <!-- ko text: element[attribute].value --><!-- /ko -->
+        <!-- /ko -->
+    <!-- /ko -->
     <button type="button"
             class="action action-edit-address"
             data-bind="visible: !isAddressSameAsShipping(), click: editAddress">

app/code/Magento/Checkout/view/frontend/web/template/shipping-address/address-renderer/default.html

@@ -13,6 +13,11 @@
     <!-- ko if: (address().telephone) -->
     <a data-bind="text: address().telephone, attr: {'href': 'tel:' + address().telephone}"></a>
     <!-- /ko --><br/>
+    <!-- ko foreach: { data: address().customAttributes, as: 'element' } -->
+        <!-- ko foreach: { data: Object.keys(element), as: 'attribute' } -->
+            <!-- ko text: element[attribute].value --><!-- /ko -->
+        <!-- /ko -->
+    <!-- /ko -->
     <!-- ko if: (address().isEditable()) -->
     <button type="button"
             class="action edit-address-link"

app/code/Magento/Checkout/view/frontend/web/template/shipping-information/address-renderer/default.html

@@ -13,4 +13,9 @@
     <!-- ko if: (address().telephone) -->
     <a data-bind="text: address().telephone, attr: {'href': 'tel:' + address().telephone}"></a>
     <!-- /ko --><br/>
+    <!-- ko foreach: { data: address().customAttributes, as: 'element' } -->
+        <!-- ko foreach: { data: Object.keys(element), as: 'attribute' } -->
+            <!-- ko text: element[attribute].value --><!-- /ko -->
+        <!-- /ko -->
+    <!-- /ko -->
 <!-- /ko -->