Redwood: Validate Taxpayer ID in Supplier Registration with TINCheck by Sovos

Summary:

In 26C: Redwood: Validate Taxpayer ID in Supplier Registration with TINCheck by Sovos.

In our case 90% Supplier will be integrated from Coupa, but this feature says it triggers on registration request or direct manual supplier creation, so I wanted to know:

1. Is this feature work in case of integrated supplier. If yes, when will it trigger that validation? because in case of integration, we are not sending registration approval.
2. Can something be done with Rest API for integrated supplier?
3. Whatever fields are there on Coupa for Supplier, can all those details be mapped or populated on TINCheck without going for any DFF?