Merge pull request #8514 from magento/db_b2b_notes

Added new feature to B2B release notes.

Author: dobooth

src/guides/v2.4/release-notes/b2b-release-notes.md

@@ -11,6 +11,8 @@ These release notes can include:
 
 ## Magento B2B - Version 1.3.1
 
+-  {:.new} Online payment methods are now supported for purchase orders.
+
 -  {:.fix} Adding a configurable product to the shopping cart directly from a requisition list when this product was used in a prior order no longer returns a system error. [GitHub-302](https://github.com/magento/partners-magento2b2b/issues/302)
 
 -  {:.fix} Magento now displays the Requires My Approval tab correctly for purchase orders when a split database configuration is deployed. [GitHub-259](https://github.com/magento/partners-magento2b2b/issues/259)