How/whether to handle token sharing use cases

[ianbjacobs]

Giulio asked some interesting questions about token sharing use cases:
https://lists.w3.org/Archives/Public/public-payments-wg/2018May/0023.html

We discussed this somewhat at the 15 May tokenization task force call:
https://www.w3.org/2018/05/15-wpwg-minutes#item01

I am logging this issue for further input and discussion.

[ianbjacobs]

From 12 June discussion (call), suggestion to look at See 8.1.1.2 of EMVCo framework.