Using Stripe and setup an API inside the extension

Hello ! I am able to make queries to stripe using what was explained on the website : https://docs.plasmo.com/quickstarts/with-stripe But what i don't understand, is what to put inside : PLASMO_PUBLIC_API_URI=http://localhost:8472 when it will be in production. Do you have any idea ? I won't have a server on vercel, so what should i use instead of the localhost server ?
Plasmo Docs
Quickstart with Stripe – Plasmo
A step-by-step guide on how to integrate Stripe with your browser extension.