I second this... make this an option for the CMNA/CMNO cert holders and the certs will have more value. ... View more

What you could do is configure the WiFi for pre-paid billing.  You can then pre-print the cards with have PIN numbers on them.  You can say that the PIN code expires after a set period of time.   https://documentation.meraki.com/MR/Splash_Page/Configuring_a_Prepaid_Card_Billing_SSID ... View more