Its great to see WHMCS has finally implemented what is essentially PayPal agreements which has been requested for a very long time.
A lot of hosts depend on third party modules which does what the new "vault" does. Can you please ensure there is a easy migration process for those using third party modules with saved agreements already in pay method?
Eg.
https://marketplace.whmcs.com/product/5623-lcwsoft-paypal-billing-agreements
And the old "MyWorks PayPal Billing Agreements"
Or anyone testing can try delete the LCW module and migrate existing over to the new module and confirm it works without any changes?