Thanks for sharing this -- that's an impressive cost amount for that service, in the range of 20 euros for the event with that amount of queries is pretty impressive, with little to no maintenance. The cost makes it sound like a full on win for serverless.

Anything interesting about the deployment method, choice of language, containerization/etc that made it particularly easy? There are tools in this domain (vercel springs to mind) that have adopted the static-site-over-serverless-something) model, but it sounds like you all had an easy time with just loading some workers up, did you do anything fancy to facilitate the frontend serving? I assume with the stripe proxy bit was just using Stripe's various (great) APIs for customer creation, one time charges (I guess?).

Curious about the technicals of the setup, you've baited us (HN) in at this point, give out those gory details!