Re: [w3c/payment-request] remove currencySystem member (#694)

> It would be helpful if that could include some description of what will be supported. Specifically, can someone use PR API to accept a Bitcoin, Ethereum or XRP payment for example?

Yes, absolutely. 

> I think I understand the current implementations as being able to handle any currency that is expressed as a 3 char code but would like to confirm that this is not limited to the official ISO 4217 set?

I think for v1, we should do ISO 4217 (get us past CR). But, in parallel (like starting today!), we should spin up our own currency registry (similar to the card brands registry) - and we should use that registry to coordinate with the ISO folks. Basically, currency codes we come up with should end up in future updates to ISO 4217.  [According to Wikipedia](https://en.wikipedia.org/wiki/ISO_4217#Cryptocurrencies), ISO is already considering some preliminary cryptocurrency codes. @ianbjacobs, do we know anyone at SIX Interbank Clearing AG we can talk to?



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