chore(docs): Updated API Reference (automated) (#9728)

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

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
Co-authored-by: Shahed Nasser <27354907+shahednasser@users.noreply.github.com>

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

@@ -10,6 +10,9 @@ required:
   - starts_at
   - ends_at
   - budget
+  - created_at
+  - updated_at
+  - deleted_at
 properties:
   id:
     type: string
@@ -79,3 +82,18 @@ properties:
           property holds the total amount discounted so far. If the limit is
           `usage`, it holds the number of times the campaign's promotions have
           been used so far.
+  created_at:
+    type: string
+    format: date-time
+    title: created_at
+    description: The date the campaign was created.
+  updated_at:
+    type: string
+    format: date-time
+    title: updated_at
+    description: The date the campaign was updated.
+  deleted_at:
+    type: string
+    format: date-time
+    title: deleted_at
+    description: The date the campaign was deleted.