Adds an event handler that runs when the CAPTCHA challenge is successfully completed.
Once the CAPTCHA challenge has been successfully completed by the user, the onVerified
callback is triggered and a CAPTCHA token is generated.
If the clickable element for triggering the submit or another restricted operation was disabled, enable it.
handler(): Promise<void> | void The name of the function or
the function expression to run when the CAPTCHA is verified.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.