The MerchantValidationEvent method complete() takes merchant-specific information previously received from the validationURL and uses it to validate the merchant.

All you have to do is call complete() from your handler for the merchantvalidation event, passing in the data fetched from the validationURL.

validationData or merchantSessionPromise

An object containing the data needed to complete the merchant validation process, or a Promise which resolves to the validation data.

None (undefined).

This exception may be passed into the rejection handler for the promise:

InvalidStateError DOMException

Returned if the event did not come directly from the user agent, but was instead dispatched by other code. Another payment request is currently being processed, the current payment request is not currently being displayed to the user, or payment information is currently being updated.

In this example, we see the client-side code needed to support merchant validation for a payment request called payRequest:

payRequest.onmerchantvalidation = (event) => {
  const validationDataPromise = getValidationData(event.validationURL);
  event.complete(validationDataPromise);
};

function getValidationData(url) {
  // Retrieve the validation data from the URL
  // …
}

This code sets up a handler for the merchantvalidation event. The event handler calls a function, getValidationData(), which retrieves the data from the validation URL, then passes that data (or a promise to deliver the data) into complete().

• Payment Request API
• Using the Payment Request API
• Payment processing concepts