Not working!

Hi,

I want to grab/access the radio button value from what the user selected.
For example, in my contact form [radio card “cake” “balloons” “flowers”].

I want to store my values into the database, the text values are working fine, but not the radio buttons..

Below is the code where I want the selected radio value to be emailed to me, just to see if I am getting the correct value from the radio buttons. I have tried text values, it works, but not the radio buttons. I also want to make sure the radio button value is not empty using posted_data.

What is the issue ??

add_action( 'wpcf7_before_send_mail', 'CF7_pre_send' );

function CF7_pre_send($cf7) {

	$submission = WPCF7_Submission::get_instance();

  	if ( $submission ) {
  	//make sure the form title is ask a question
	  	if($cf7->title == "Ask a question"){
	  		$posted_data = $submission->get_posted_data();
	  	 	$mail = $cf7->prop('mail');
                        //In my contact form [radio card  "cake" "balloons" "flowers"]
	  		$radiovalue = $posted_data['card'];
                       //added to the message
		       $mail['body'] .=  $radiovalue;
			$cf7->set_properties(array('mail' => $mail));
		}
  }

}

https://wordpress.org/plugins/contact-form-7/