Processing of microdata of the products which has reduced price

Two types of prices can be indicated in the Product feed: the regular price of the product and the current reduced price. This information can be identified using microdata or Open Graph.
An example of markup using the priceSpecification element:
<div itemscope itemtype="">
  <h1 itemprop="name">The Best Product Name</h1>
  <div itemprop="offers" itemscope itemtype="">
    <strike itemprop="price">1000.00</strike>USD
    <meta itemprop="priceCurrency" content="USD" />
    <span itemprop="priceSpecification" itemscope   
        <strong itemprop="price">900.00</strong>USD
        <meta itemprop="priceCurrency" content="USD"/>
        (Offer valid until 2029-01-12)
        <meta itemprop="validThrough" content="2029-01-12T00:00:00"/>

An example of Open Graph markup using the sale_price element:
    <meta property="og:type" content="product" /> 
    <meta property="og:title" content="The Best Product Name" /> 
    <meta property="product:price:amount" content="1000.00" />
    <meta property="product:price:currency" content="USD" />
    <meta property="product:sale_price:amount" content="900.00" />
    <meta property="product:sale_price:currency" content="USD" />