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.
Developers are opting for phone verification over email verification as it is effective in reducing spam accounts. Adding phone verification to your app doesn't need to be complex. This tutorial shows how to use Nexmo Verify SDK for iOS in a "To-Do List" application that uses Parse for a backend.