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The respondWith() method of the PaymentRequestEvent interface prevents the default event handling and allows you to provide a Promise for a payment handler response object yourself.
promise
A payment handler response object or a Promise that resolves to one. This object should contain 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.
None (undefined).
The example below is taken from Open the payment handler window to display the web-based payment app frontend. Read the article to understand the context of the code.
self.addEventListener("paymentrequest", async (e) => {
// Retain a promise for future resolution
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 new Error("Failed to open window");
}
} catch (err) {
// Reject the promise on failure
resolver.reject(err);
}
});
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