Despite following the recommended steps.
Under wireless, configure, ssids , billing(paid access).
Despite choosing paid or fee.
There is no section for generate prepaid codes.
As shown in the documentation.
https://documentation.meraki.com/MR/MR_Splash_Page/Configuring_a_Prepaid_Card_Billing_SSID
First you must determine the amount to be released, which can be hourly, daily, weekly or monthly.
After that, in Wireless > Configure > prepaid cards, you must create one in the batch and then define the Face value that must match the values you defined.
For example, in the image above, I defined 15 dollars for the daily, so I have to define the Face value to 15.
After that it should work.
