Re: [w3c/webpayments] Should payment method specifications contain WebIDL? (#133)

@AxelNennker - I think the core argument is that WebIDL is limited.

i.e. There may be cases where somebody wants to define a payment method that has a data model for the payment method specific data that cannot be modeled in WebIDL because they want to use some more flexible extensibility mechanism.

Ultimately the payment method spec is an interface contract between the payment app and the payee system (or that of their PSP) so they it could be defined in whatever way makes them both comfortable.

My feeling is that we should not prescribe that it must be WebIDL.

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