Have others had success with selecting and implementing a Banking Validation Tool or Subscription for vendor onboarding and changes? Not looking for an onboarding capability, solely validating supplier banking details to avoid manual validations.

We are currently going through the review of such tools/subscriptions. Not only are we looking to have a service that covers most of the world, we are also looking to deeply embed it into our workflows to automate the approvals for onboarding suppliers and changes in master data including tax id no, addresses, or entity legal names. 
Let me know if you want to connect directly. 

We leverage Apexanalytix. This is a Koch supported contract, and is most heavily used in the US and UK. If you need more information I can connect you to our business partner.