title: how to add product from external page into virtuemart while click on some button
body: <p>I am trying to add a product directly to cart which is in virtuemart from external page. I have one external page there I have a button. </p>
  
  <p>When we click on that button, the product details should go to cart in virtuemart and it should not affect the virtuemart add to cart functionality.</p>
  
  <p>What should I do to make it possible. If you know the answer help me. thanks in advance.</p>