Re: [w3c/payment-request] Feature Request - Pre Authorization (#633)

I'm in the same boat as @marcoscaceres in that I believe the current API can accommodate the use case. I would recommend to use of [payment handler API](https://w3c.github.io/payment-handler/), if we decide to go with the `CanMakePayment` event firing design. Your `PaymentRequest` code would look like this:

```javascript
let paymentRequest = new PaymentRequest(
    [{supportedMethods: 'https://chadcampbell.com/preauth'}], ...);
// Send `CanMakePayment` event to the payment handler.
paymentRequest.canMakePayment()
    .then(function(res) {
      if (res) {
       // The payment handler has pre-authorized a transaction
       // with some static amount, e.g., USD $1.00.
      } else {
        // Pre-authorization failed or payment handler not installed.
      }
    })
    .catch(function(ex1) {
      // Unexpected error occurred.
    })
;
```

In your payment handler, you would write the following:

```javascript
self.addEventListener('canmakepayment', function(evt) {
  // Pre-authorize here.
  let preAuthSuccess = ...;
  evt.respondWith(preAuthSuccess);
});
```

This payment handler would need to live in a service worker at `https://chadcampbell.com/preauth` scope.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/payment-request/issues/633#issuecomment-332523214