402 Payment Required is a status-code described by the standard as:
The original idea may have been that commercial websites and APIs would want
to have a default way to communicate that a HTTP request can be repeated,
after a user paid for service.
The RFC suggests that it’s not a good idea to use this status code today,
because it may get a better definition in the future, possibly making existing
sites incompatible with HTTP.
That being said, it hasn’t really stopped people from using the code anyway.
So should you use it? The RFC says no. But, I also don’t think there’s a major
risk in doing so.
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