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Re:Show HN: Print a WiFi Login Card by daveevad on Sunday May 31, 2020 @04:09PM (#23372283)
it sounds to me like it's a custom url scheme built into ios.

https://developer.apple.com/documentation/uikit/inter-proces...

Re:Show HN: Print a WiFi Login Card by kevin_thibedeau on Sunday May 31, 2020 @04:38PM (#23372521)
It's vCard, not URL.