[Tagging] Bitcoin: Distinction of purchase through website and cash register/Point of sale

[Andreas Goss]

> I think it should be website:payment:bitcoin=yes instead of
> payment:website:bitcoin=yes

I think this makes sense for things like Wikidata, where you then have 
architect=* and architect:wikidata=* grouped together, but with payment 
it would be better to have all the payment= options grouped together. I 
think this is also easier for mappers, because then I don't have to look 
at the bottom for website:payment and at the top for delivery:payment, 
but just have payment=, payment:website= and payment:delivery=* next to 
each other.

> Payment:xxx=* is a tag reserved for offline
> payment methods

The problem is that it isn't black&white. For example payment via a 
phone number or smartphone app could be both. So I would say 
payment=yes, payment:credit_cards=yes etc. should be offline by default, 
but payment key itself should not be limited to that.
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