The PaymentAddress interface of the Payment Request API is used
store shipping or payment address information.

The PaymentCurrencyAmount dictionary describes an amount of money
terms of both a number of units and the currency (US dollars,
yen, etc.), and is part of the Payment Request API.

The PaymentDetailsUpdate dictionary is used to provide updated
to the payment user interface after it has been instantiated.

The PaymentMethodChangeEvent interface of the Payment Request
describes the paymentmethodchange event which is fired by some
handlers when the user switches payment instruments (e.g., a
selects a \"store\" card to make a purchase while using Apple

The Payment Request API's PaymentRequest interface the primary
point into the API, and lets web content and apps accept payments
the end user on behalf of the operator of the site or the publisher
the app.

PaymentRequest Events.

The PaymentRequestEvent interface of the the Payment Request
is the object passed to a payment handler when a `payment.PaymentRequest`
made.

The PaymentRequestUpdateEvent interface is used for events sent
a `payment.PaymentRequest` instance when changes are made to
information for a pending `payment.PaymentRequest`. Those events

The PaymentResponse interface of the Payment Request API is returned
a user selects a payment method and approves a payment request.