PaymentRequest.onshippingaddresschange

The onshippingaddresschange event of the PaymentRequest interface is fired whenever the user changes their shipping address, including when an address is added by the user for the first time.

PaymentRequest.addEventListener('shippingaddresschange', shippingAddressChangeEvent => { ... });

PaymentRequest.onshippingaddresschange = function(shippingAddressChangeEvent) { ... };

The shippingaddresschange event is triggered by a user-agent controlled interaction. If the address stored by the user agent changes at any time during a payment process, the event is triggered. To make sure an updated address is included when sending payment information to the server, you should add event listeners for a PaymentRequest object after instantiation, but before the call to show().

// Initialization of PaymentRequest arguments are excerpted for clarity.
var payment = new PaymentRequest(supportedInstruments, details, options);

request.addEventListener('shippingaddresschange', function(evt) {
  evt.updateWith(new Promise(function(resolve) {
    updateDetails(details, request.shippingAddress, resolve);
  }));
});

payment.show().then(function(paymentResponse) {
  // Processing of paymentResponse exerpted for the same of clarity.
}).catch(function(err) {
  console.error("Uh oh, something bad happened", err.message);
});