Re: [webpayments] What are the WPWG February 2016 face-to-face prioritized issues (#89)

> We should consider this in the finer details of the design. The flexibility that the checkout API offers is my preference but we need to consider situations where a call like request('billingAddress') may be made in future in a browser that only supports returning the shipping address. i.e. Versioning

Instead of versioning, I would prefer feature detection. For example:

```js
if (checkout.supports('billingAddress')) {
  checkout.request('billingAddress');
}
```

or:

```js
if (checkout.requestBillingAddress) {
  checkout.requestBillingAddress();
}
```


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Reply to this email directly or view it on GitHub:
https://github.com/w3c/webpayments/issues/89#issuecomment-185484061