This seems like your previous post https://community.meraki.com/t5/Developers-APIs/Assistance-Required-for-Using-UniFi-Captive-Portal-with-Meraki/m-p/283691   The provider of captive portal typically provides instructions on how to configure access points to work with their portal.   For instance, the non-Meraki portal might use Radius to grant authentication to clients connecting via Meraki APs, with Purple there's a set of config instructions to set up Dashboard to work with it https://support.purple.ai/hc/en-gb/articles/7580733017885-Cisco-Meraki-AP-MX-Z1  maybe you can compare to your UniFi portal instructions to see if there're any parallels that give a clue.   I suggest contact whoever provides your UniFi support and ask them for their instructions, I'm sure it won't be the first time they've been asked. If they don't support Meraki integration out of the box, you might need to build your own integration using the UniFi API to talk to the Meraki API to get things to work. ... View more

Did you know that Meraki WiFi has a built in coupon system? https://documentation.meraki.com/MR/MR_Splash_Page/Configuring_a_Prepaid_Card_Billing_SSID   The most common deployment I do is the "fast pre-paid", because it doesn't require the billing engine.  You can use coupon codes without needing anything else. https://documentation.meraki.com/MR/MR_Splash_Page/Customizing_Splash_Pages_for_Fast_Prepaid_Card_Billing_SSIDs   ... View more

If the user is connecting to 2.4 or 5 GHz, check the Channel configuration in the RF profile. If you're using 5 GHZ, configure with 80 channels. If you have a wider channel, you will get more throughput.   ... View more