Voucher Authentication without Captive Portal Logon

New project for hotel, ~15 AP's. Primary goals are reliability and easy access for guests.

• Access control via SSID logon only.
• No web portal logon required!
• Front desk can easily manage voucher creation.
• Multiple device access from single voucher.
• Voucher options:
  *Duration/expiration
  *SSID
  *Printable voucher with SSID, credentials, expiration date & time.
• User separation
• Bandwidth management
• System fails to open access if it loses connectivity to authentication service.
• No payment, upsell, AUP, logging features needed.

We usually install Unifi but I believe that would require 3rd party Radius + Voucher system. New install so AP's / Gateway/ Authentication system can be anything.

Google returns too many options, suggestions?