The process requires a government-issued photo ID and, in some cases, a live selfie captured through a phone or webcam. Accepted documents include passports, driver’s licenses, and national ID cards. Photocopies, screenshots, scans, photos of a photo, digital or mobile IDs, non-government IDs, and temporary paper IDs are not allowed. The system relies on a third-party provider, Persona, to process verification data.
Source: www.helpnetsecurity.com