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Web Monetization refers to this new technology

https://webmonetization.org/docs/getting-started

https://webmonetization.org/docs/api

More info on https://coil.com/

Generally you want to detect if WM is supported and paying, then unlock features / disable ads if that is the case. It could be you get unlimited lives if WM is detected, you get 1x special key a day, extra special chests spawn in the world if WM is enabled, that kind of thing.