Re: [w3c/webpayments] [Tokenized Card Payment] Replace usage of 'last4' with 'suffix' (#211)

> Interesting, so how would the provider of the token know how many digits to include? 

That's not something they'd know from this spec. It's specific to the local scheme rules. The spec must simply accommodate as many of the various rules that are out there.

Another consideration is where this field holds just the "unmasked" PAN values (`1234`) or a masked PAN including the masking characters (`************1234`). If it is the latter I'd recommend calling the field `maskedPan` or similar.

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