WooCommerce custom place order validation
<p>I would like to do som additional checks when the user has submitted an order in Woocommerce. Have tried using different add_filter methods, but it seems that I can't hook up to a place_order filter. I have tried with:</p>

<pre><code>add_filter('woocommerce_place_order', 'checkFields'); //on ordersubmit
function checkFields(){
  if($this != true){
    //not allowed to place order because of data is not true
  }else{
   //continue order
  }
}
</code></pre>

<p>But non of above is being triggered when I submit the checkout form.
Any suggestions? :)</p>