ID verification add-on pricing

I am planning to use the ID verification add-on. I’d like to ask a few questions on its pricing:

• Does the Personal Plan fit the requirements of the ID verification add-on? Or it is available only from Standard or higher tiers?
• Is the ID verification add-on free / one-time purchase / subscription?
• In case it is not free, where can I get information on its pricing before upgrading my plan?