Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

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.

Return value



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

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);

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().


Specification Status Comment
Payment Request API
The definition of 'MerchantValidationEvent.complete()' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
complete()Chrome No support NoEdge ? Firefox Full support 64
Full support 64
Notes Available only in Nightly builds.
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android Full support 64
Full support 64
Notes Available only in Nightly builds.
Opera Android No support NoSafari iOS ? Samsung Internet Android No support No


Full support Ā 
Full support
No support Ā 
No support
Compatibility unknown Ā 
Compatibility unknown
See implementation notes.
See implementation notes.

See also