can the payment request be static or is it always interactive?
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It can be static. Here is the base spec:
Here is the PR that extends NUT-18 for HTTP402 and defines the protocol: 
GitHub
nuts/18.md at main · cashubtc/nuts
Cashu protocol specifications https://cashubtc.github.io/nuts/ - cashubtc/nuts
GitHub
NUT-24: HTTP Payment required by hzrd149 · Pull Request #239 · cashubtc/nuts
This PR adds NUT-24 that describes how the HTTP 402 status code + an X-Cashu header can be used to require payment for http resources
readable vers...