BSI PAS 1296 is the only current internatonal standard for online age checking. The ISO and IEEE are also developing standards that will define a framework for age assurance and a best practice process for implementing age verification, expected to be published this year and in 2024 respectively.
Audits are carried out by government-accredited Conformity Assessment Bodies. The UK Accreditation Service (UKAS) is responsible for this in the UK. AV Providers are assessed against a certificaton scheme which is independently governed and incorporates the relevant standards. Certification has to be regularly reviewed, and the Certification Body will consider any complaints that providers are not acting in accordance with the Scheme, and can withdraw the certificate. Consumers can also check with the Certification Body to see which providers have been approved – and more importantly, so can the websites which are selecting providers so they can ensure they are using only audited suppliers.
The Age Check Certificaton Scheme audits compliance with BSI PAS 1296.
Companies which have been audited to this and other related standards are listed here.