When the login & account recovery flows are 

https://news.ycombinator.com/item?id=14718799 …pic.twitter.com/jdOttFJvYW
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But what about just letting them pay the bill? It sounds like they're unable to even make a payment.
true. I wonder if there are security risks in adding a method of payment...
Most US businesses that bill people will let you pay by credit card over the phone. Not sure why that shouldn't work in the case.
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