[w3c/webpayments-methods-tokenization] Difference between "issuer token" ans "gateway token" (#3)

Hi all,

What is the difference between "issuer token" ans "gateway token" ?


> "issuer": With these tokens, a provider serves as a card issuer by generating a new card number.

Does it means, that this token can only have this format : XXXX XXXX XXXX XXXX or a simple string can be used ?

> There are other types of tokens such as gateway tokens, but because they involve substantially different flows of information (e.g., merchant onboarding), this specification does not cover them

When dealing with tokenization, i'm quite sure that token services require some kind of onboarding/enrollment .. does it make sence to split all these custom tokens ? having only one "issuer token" with some metadata should'nt be more easy to use..?

Only some thougth about tokenization..
Nelson 

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