[w3c/webpayments-methods-tokenization] Key provider registration details lacking (#31)

Creating an individual issue from the list in #26 in reference to:
  https://github.com/w3c/webpayments-methods-tokenization/wiki/Tokenized-Card

"With respect to "Token Service Providers MAY require KeyProviders to register/onboard." - register with a third-party service such a clearinghouse, with the Token Service Provider itself, or both? What is the purpose of such registration (e.g., so that the Token Service Provider can restrict its interactions to trusted entities)?"



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