Show example of .complete("unknown")

[marcoscaceres]

As part of #583, we've somewhat struggled to come up with a real use case for completing a payment response with "unknown".

Although "unknown" feels like a good idea, can anyone think of a real use case where:

• somehow you get into the "unknown" situation?
• "fail" doesn't suffice?

If we can't come up with something useful, we should probably mark it "at risk".

Also noting that Chrome (on desktop) currently treats .complete("unknown") the same as .complete("success"), in that it just closes the payment sheet and doesn't inform the user about anything.

I'm not sure yet what we will do in Firefox. It will depend on the outcome of this discussion, I guess.

In the spec, "unknown" plays no role in any algorithm.

[marcoscaceres]

Talked to @zkoch, he mentioned 3D Secure can lead to "unknown".

[zkoch]

@marcoscaceres , are you OK to close this issue?

[marcoscaceres]

Was going to add something to the .complete() example. I'll update the bug title to not confuse people.

[ianbjacobs]

@marcoscaceres, can we close this issue now?

Ian