chore(docs): Updated API Reference (v2) (#9033)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

Co-authored-by: Shahed Nasser <27354907+shahednasser@users.noreply.github.com>

www/apps/api-reference/specs/admin/components/schemas/OrderPreview.yaml

@@ -5,8 +5,8 @@ required:
   - order_change
   - status
   - currency_code
-  - id
   - version
+  - id
   - original_item_total
   - original_item_subtotal
   - original_item_tax_total
@@ -671,14 +671,14 @@ properties:
     type: string
     title: currency_code
     description: The order preview's currency code.
-  id:
-    type: string
-    title: id
-    description: The order preview's ID.
   version:
     type: number
     title: version
     description: The order preview's version.
+  id:
+    type: string
+    title: id
+    description: The order preview's ID.
   region_id:
     type: string
     title: region_id
@@ -724,6 +724,8 @@ properties:
       - balance
       - paid_total
       - refunded_total
+      - pending_difference
+      - raw_pending_difference
     properties:
       total:
         oneOf:
@@ -935,6 +937,23 @@ properties:
           - type: object
             description: The summary's refunded total.
             x-schemaName: IBigNumber
+      pending_difference:
+        oneOf:
+          - type: string
+            title: pending_difference
+            description: The summary's pending difference.
+          - type: number
+            title: pending_difference
+            description: The summary's pending difference.
+          - type: string
+            title: pending_difference
+            description: The summary's pending difference.
+          - type: object
+            description: The summary's pending difference.
+            x-schemaName: IBigNumber
+      raw_pending_difference:
+        type: object
+        description: The summary's raw pending difference.
   metadata:
     type: object
     description: The order preview's metadata.