STRIPE as a payment system for selling WIFI

I found Willie’s video from about 6 years ago which was easy enough to follow, thank you very much. The issue I’m having is I’m getting 402 errors on the backside in Stripe. I’m using the Test Secret key and from what I can tell from the logs, Stripe is complaining about sending card numbers over the air.
I’m repurposing an old UDM using a Guest network with two packages. A free 5 min trial and a 5 hour paid version.
The free version works just fine so I know the networking side is squared away but I’m stumped on the payment side. Than you in advance for any assistance.

It’s been a minute since we use the integrated strip payment setup – we’ll have to revisit it and see what we find out.