Save (on-click) Action Gmail

save_action.html

<div itemscope itemtype="http://schema.org/EmailMessage">
  <div itemprop="action" itemscope itemtype="http://schema.org/SaveAction">
    <meta itemprop="name" content="Save Offer"/>
    <div itemprop="handler" itemscope itemtype="http://schema.org/HttpActionHandler">
      <link itemprop="url" href="https://offers-everywhere.com/save?offerId=xyz789"/>
    </div>
  </div>
  <meta itemprop="description" content="$5 meal at Joe's Diner"/>
</div>

<!--
description	Text	Snippet of text describing the contents of the email.
action	Action	(required) Actions supported for EmailMessage.
action.name	Text	The string shown to the user on the UI element tied to the action.
action.handler	HttpActionHandler	(required) Service or Application that may handle the action.
action.handler.url	URL	(required) URL to the handler that can perform the action.
action.handler.method	HttpRequestMethod	Whether to use HTTP GET or POST. GET is the default.
action.handler.requiresConfirmation	Boolean	If true, additional confirmation is required before the handler executes.
publisher	Organization	The entity responsible for publishing the message. Also accepts a string (e.g. "").
publisher.name	Text	Name of the Organization.
publisher.url	URL	URL of the Organization.
publisher.url/googlePlus	URL	URL of the Google+ Page for the organization.
-->