Sends a test email. Use this method to preview your email campaign.
We strongly recommend you calling this method only a few times in a row, as it has a rate limit.
You can only call this method when authenticated as a Wix app or Wix user identity.
Campaign ID.
Email subject.
Recipient email address.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.