title: How do I pass parameters in WooCommerce redirect..?
body: <p>I've read a related question, "Redirect to custom URL after user clicks 'Proceed to checkout' at the cart page (wordpress)" and I got that part!  But how can I pass three parameters, Product ID, Order ID and Promo Codes?</p>
  
  <pre><code>add_filter('woocommerce_get_checkout_url', 'dre_redirect_checkout');
  
  function dre_redirect_checkout($url) {
       global $woocommerce;
       $checkout_url = 'https://........';
       return  $checkout_url; 
  }
  </code></pre>