What system versions are supported by Pay Passkey? Recommended: iOS 16+ and Android 9+. Android devices must be able to log into Google services.2. How do Pay Passkeys differ from exchange Passkeys? They're two completely independent Passkey systems. You may have an exchange Passkey for exchange logging in and trading, but a separate Pay Passkey must be created for their Pay account. The Pay Passkey is used solely for signing transactions in Pay mode.3.