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PaymentManager - Web APIs | MDN
userHint
Experimental
Provides a hint for the browser to display along with the payment app's name and icon in the Payment Handler UI.
enableDelegations()
Experimental
Delegates responsibility for providing various parts of the required payment information to the payment app rather than collecting it from the browser (for example, via autofill).
navigator.serviceWorker.register("serviceworker.js").then((registration) => {
registration.paymentManager.userHint = "Card number should be 16 digits";
registration.paymentManager
.enableDelegations(["shippingAddress", "payerName"])
.then(() => {
// …
});
// …
});