[w3c/payment-request] canMakePayment always return false (#708)

Hi,
I'm trying to understand why canMakePayment always return false although I have setup a card in the broswer. (When testing locally it always return true).

I configured a Visa test card in Chrome 4111111111111111 and also a real mastercard.
I'm attaching the browser console. Am I doing something wrong? Is there a problem maybe?   

```
const methodData = [{
        supportedMethods: "basic-card",
        data: {
            supportedNetworks: ["mastercard","visa"],
            supportedTypes: ["debit", "credit"]
        }
    }
];
const details = {
    total: {
        label: "Total due",
        amount: {currency: "USD", value: "10.00"}
    }
};
var request = new PaymentRequest(methodData, details);
PaymentRequest {id: "c12d264e-f677-49c8-b050-2252e38f5e24", shippingAddress: null, shippingOption: null, shippingType: null, onshippingaddresschange: null, …}
request.canMakePayment().then((result) => {
console.log(result);
});
Promise {<pending>}
__proto__: Promise
[[PromiseStatus]]: "resolved"
[[PromiseValue]]: undefined

false
```



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