title: Shopify API: Get url that leads directly to checkout
body: <p>What options are there to forward people directly to a checkout page for a specific product in a Shopify store?</p>
  
  <p>This is interesting for me for the following scenario:</p>
  
  <ol>
  <li>User goes on my website where I talk about a product</li>
  <li>Clicks a-href button</li>
  <li>Gets directed to the checkout page (not product page) on my Shopify store</li>
  </ol>
  
  <p>I have read the Product-sections on the API documentation but couldn't find a hint.</p>