olemus
American Expressi autentimisteenus,
põhineb protokollil 3-D Secure

ülevaateid
https://www.americanexpress.com/us/security-center/safekey/

https://network.americanexpress.com/globalnetwork/products-and-services/security/safekey/

https://www.americanexpress.com/ca/en/security/safekey/faqs/