Should OTPCredential have transport?

[samuelgoto]

Earlier, @mikewest said:

I'm curious about the value of informing the developer about the transport over which the OTP was delivered. Won't they know how they went about sending the value to the user? Is there additional benefit to encoding that in the OTPCredential object as well?

In this thread. This issue is tracking the resolution to that question.

interface OTPCredential : Credential {
  readonly attribute DOMString code;
}