| PASS Must be possible to construct a payment request | |
| PASS Throws if the promise [[state]] is not "created" | |
| PASS If the user agent's "payment request is showing" boolean is true, then return a promise rejected with an "AbortError" DOMException. | |
| PASS If payment method consultation produces no supported method of payment, then return a promise rejected with a "NotSupportedError" DOMException. | |
| PASS If the user aborts the payment request algorithm, then return a promise rejected with an "AbortError" DOMException. | |
| PASS A request is updated when show()'s detail promise resolves. | |
| PASS Change events do not occur until show()'s detail promise resolves. | |