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Android.

Show me a german webshop that supports modern payment methods. It usually old school bank transfers still.

How to make a crap system that users will hate: Let some architecture astronaut decide what characters should be valid or not.

And parentheses. And spaces (that may, or may not, be trimmed). And all kind of unicode equivalent characters, that might have to be canonicalized. Why not treat it as a byte buffer anyway.