wp_redirect not working inside add_action( ‘wpcf7_after_flamingo’)

Hello,

See below code:

function action_wpcf7_after_flamingo( $result ) {
 if($result['contact_form_id'] == 329){
   /** SOME CALCULATIONS HERE **/ 
    $url = ; //Url to payment Checkout
     wp_redirect($url);
     exit;
 }
}

add_action( 'wpcf7_after_flamingo', 'action_wpcf7_after_flamingo', 10, 1 );

In above function, i am able to do some calculations based on contact form values. After doing some calculations, i want to redirect my browser to another URL but wp_redirect() is not working. Can you please tell me how can i redirect to another URL inside any add_action();