The Payment Request API'sPaymentRequest interface is the primary access point into the API, and lets web content and apps accept payments from the end user on behalf of the operator of the site or the publisher of the app.
If requested via payment options, returns the shipping address chosen by the user for the purposes of calculating shipping. This property is only populated if the constructor is called with the requestShipping flag set to true. Additionally, in some browsers, the parts of the address will be redacted for privacy until the user indicates they are ready to complete the transaction (i.e., they hit "Pay").
Returns the identifier of the selected shipping option. This property is only populated if the constructor is called with the requestShipping flag set to true.
Returns the type of shipping used to fulfill the transaction. This will be one of shipping, delivery, pickup, or null if a value was not provided in the constructor.
With some payment handlers (e.g., Apple Pay), this event handler is called to handle the merchantvalidation event, which is dispatched when the user agent requires that the merchant validate that the merchant or vendor requesting payment is legitimate.
With some payment handlers (e.g., Apple Pay), dispatched whenever the user changes payment instrument, like switching from a credit card to a debit card.