BasicCardResponse.cardNumber

The cardNumber property of the BasicCardResponse dictionary contains the number of the card used to make the payment.

"cardNumber" : "number"

A DOMString representing the credit card number.

Let's look at a sample payment request:

var request = new PaymentRequest(supportedInstruments, details, options);

// Call show() to trigger the browser's payment flow.
request.show().then(function(instrumentResponse) {
  // Do something with the response from the UI.
  console.log(instrumentResponse.details);
})
.catch(function(err) {
  // Do something with the error from request.show().
});

Once the payment flow has been triggered using PaymentRequest.show() and the promise resolves successfully, the PaymentResponse object available inside the fulfilled promise (instrumentResponse above) will have a PaymentResponse.details property that will contain response details. This has to conform to the structure defined by the BasicCardResponse dictionary, and may look something like this:

{
  "cardNumber' : '9999999999999999",
  "cardholderName' : 'Mr. Dick Straw",
  "cardSecurityCode" : "999",
  "expiryMonth" : "07",
  "expiryYear" : "2021",
  "billingAddress" : {
    "country" : "GB",
    // etc. billing address is a PaymentAddress object
  }
}