The Verifalia PHP SDK by Cobisi provides email validation implementation with the HTTPS API. An example available presents token configuration. It also shows how to submit an email address to Verifalia without waiting for completion.
Despite attempts to reinvent it, email is still one of the most popular ways to communicate across the internet. Developers have long been able to take advantage of Emails popularity using various libraries that support POP, SMTP and IMAP. This is fine when you have access to a publicly available web server, but for small and hobby developers this can be an unacceptable cost.