Keep in mind that to use PayID properly, it's dependent on the application as well as a server properly adhering to the PayID specification. This example makes some assumptions that can be dangerous for regular use. It's very possible to lose funds if you try to mimic this kind of implementation.
Yes, it doesn't quite adhere to all parts of the spec strictly. So if a client were to be extra strict it could fail. To be clear, you wouldn't lose funds, just someone or something might not be able to resolve your payment addresses.
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Keep in mind that to use PayID properly, it's dependent on the application as well as a server properly adhering to the PayID specification. This example makes some assumptions that can be dangerous for regular use. It's very possible to lose funds if you try to mimic this kind of implementation.
Yes, it doesn't quite adhere to all parts of the spec strictly. So if a client were to be extra strict it could fail. To be clear, you wouldn't lose funds, just someone or something might not be able to resolve your payment addresses.