I'd look into the billing features of the Meraki guest portal. It allows to setup some free access per day and then you can provide users with vouchers for additional time.   Check here: https://documentation.meraki.com/MR/MR_Splash_Page/Billing_for_Wireless_Access   And here: https://documentation.meraki.com/MR/MR_Splash_Page/Configuring_a_Prepaid_Card_Billing_SSID ... View more