Have you considered configuring an SSID for pre-paid billing, and then just printing out 2,000 pre-paid tokens? You can make the value $0. https://documentation.meraki.com/MR/Splash_Page/Configuring_a_Prepaid_Card_Billing_SSID#Generating_Prepaid_Codes Personally if it was me, I think I would just make it open authentication (assuming it is only Internet access) and forget authentication.
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