updated TOC

Author: jureid

articles/billing/TOC.yml

@@ -123,6 +123,8 @@
     href: billing-mca-section-invoice.md
   - name: EA tasks in Microsoft Customer Agreement
     href: billing-mca-enterprise-operations.md
+  - name: Open banking and strong customer authentication
+    href: billing-open-banking-strong-customer-authentication.md
   - name: Resolve past due balance
     href: billing-azure-subscription-past-due-balance.md
   - name: Set up billing account for Microsoft Customer Agreement