title: WooCommerce REST API GET multiple products by ID
body: <p>I need to display all related products by eah product I have in my list.</p>
  
  <p>Eg, In my app I have 3 products with id 1, 2, 3
  product id 1 has 5,6,7 as related, product id 2 with related 8 and 9 etc..</p>
  
  <p>Now I have an array with all the related <code>[5,6,7,8,9..]</code>
  How can I get only this ones from REST API?</p>
  
  <p>I can call by single ID like that <code>site.com/wp-json/wc/v2/products/5/</code></p>
  
  <p>But doesn't work with multiple IDs like <code>../products/5/6/</code> or <code>../products/5,6/</code></p>
  
  <p>Is this possible?</p>