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PaymentRequestEvent: respondWith() method

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The respondWith() method of the PaymentRequestEvent interface prevents the default event handling and allows you to provide a Promise for a PaymentResponse object yourself.

Syntax

respondWith(promise)

Parameters

promise: A Promise that resolves with a PaymentHandlerResponse object.

Return value

A PaymentHandlerResponse object. This contains the following properties:

methodName: The payment method identifier for the payment method that the user selected to fulfill the transaction.
details: A JSON-serializable object that provides a payment method-specific message used by the merchant to process the transaction and determine a successful fund transfer. See 7.1.2 details attribute for more details.

Examples

…
self.addEventListener('paymentrequest', async e => {
…
  // Retain a promise for future resolution
  // Polyfill for PromiseResolver at link below.
  resolver = new PromiseResolver();

  // Pass a promise that resolves when payment is done.
  e.respondWith(resolver.promise);
  // Open the checkout page.
  try {
    // Open the window and preserve the client
    client = await e.openWindow(checkoutURL);
    if (!client) {
      // Reject if the window fails to open
      throw 'Failed to open window';
    }
  } catch (err) {
    // Reject the promise on failure
    resolver.reject(err);
  };
});
…

See Open the payment handler window to display the web-based payment app frontend for more details about how this would be used.

Specifications

Specification
Payment Handler API # dom-paymentrequestevent-respondwith

Browser compatibility