Re: [w3c/browser-payment-api] The "data" member of PaymentMethodData doesn't seem to actually be used for anything (#338)

The information that goes in `data` is specific to individual payment methods. See, for example, the [relevant section in the basic card specification](https://w3c.github.io/webpayments-methods-card/#request).

The requirement to be serializable is to allow payment apps to send them to a server for subsequent processing (if necessary) and to allow sending them between processes in some compatible way for communication with native OS wallets (e.g., for invoking Android native payment apps).

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