i want to get form data from checkout page in 2nd step, so i have use event observer.

I have use this `controller_action_predispatch_checkout` event.

I want to get post data so i have try this link https://magento.stackexchange.com/questions/166917/get-post-data-in-checkout-success-observer/166918 but not able to get post data.

Can any one help me how can i get post data?

> event.xml

    <event name="controller_action_predispatch_checkout">
           <observer name="ptg_paymentevent_observer_checkoutpredispatchobserver" instance="Ptg\Paymentevent\Observer\Checkoutpredispatchobserver" />
       </event>

> Checkoutpredispatchobserver.php



    <?php
    namespace Ptg\Paymentevent\Observer;
    
    use Magento\Framework\Event\ObserverInterface; 
    use Magento\Framework\Event\Observer as EventObserver; 
    
    class Checkoutpredispatchobserver implements ObserverInterface 
    {
    	protected $_request;
    	public function __construct(
    		\Magento\Framework\App\RequestInterface $request
    	)
    	{
    		$this->_request = $request;
    	}
    	
      public function execute(\Magento\Framework\Event\Observer $observer)
      {
         //$order= $observer->getData('order');
    	 //$order->doSomething(); product = $observer->getEvent()->getProduct();
    	  $reqeustParams = $this->_request->getParams(); 
    			echo '<pre>';
    			var_dump($reqeustParams);
    			echo '</pre>';
    	 
    	 		
    
    
         return $this;
    		}
      
    		}
      }
    }