custom checkout fee

gistfile1.txt

/**
 * @snippet       Custom Checkout Fee for WooCommerce
 * @author        Fabio Tielen / Code Agency / https://codeagency.be
 * @compatible    WooCommerce 3.4.5
 */
 
// Display Buttons
// Uses woocommerce_form_field()
 
add_action( 'woocommerce_review_order_before_payment', 'ca_checkout_radio_choice' );
 
function ca_checkout_radio_choice() {
     
    $chosen = WC()->session->get('radio_chosen');
    $chosen = empty( $chosen ) ? WC()->checkout->get_value('radio_choice') : $chosen;
    $chosen = empty( $chosen ) ? 'no_option' : $chosen;
         
    $args = array(
    'type' => 'radio',
    'class' => array( 'form-row-wide' ),
    'options' => array(
        'no_option' => 'Standaard 1 verzending',
        'option_1' => 'Kaartjes/enveloppen apart verzenden (€2.50)',
    ),
    'default' => $chosen
    );
     
    echo '<div id="checkout-radio">';
    echo '<h3>Apart verzenden</h3>';
    woocommerce_form_field( 'radio_choice', $args, $chosen );
    echo '</div>';
     
}
 
// Add Fee and Re-calculate Total order price
// Based on session's "radio_chosen"
 
add_action( 'woocommerce_cart_calculate_fees', 'ca_checkout_radio_choice_fee', 20, 1 );
 
function ca_checkout_radio_choice_fee( $cart ) {
  
  if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;
  $radio = WC()->session->get( 'radio_chosen' );
  if ( "option_1" == $radio ) {
    $fee = 2.5;
  } 
  $cart->add_fee( __('Extra verzending', 'woocommerce'), $fee );
  
}
 
// Refresh Checkout if Radio Changes
// Uses jQuery
 
add_action( 'wp_footer', 'ca_checkout_radio_choice_refresh' );
function ca_checkout_radio_choice_refresh() {
if ( ! is_checkout() ) return;
    ?>
    <script type="text/javascript">
    jQuery( function($){
        $('form.checkout').on('change', 'input[name=radio_choice]', function(e){
            e.preventDefault();
            var p = $(this).val();
            $.ajax({
                type: 'POST',
                url: wc_checkout_params.ajax_url,
                data: {
                    'action': 'woo_get_ajax_data',
                    'radio': p,
                },
                success: function (result) {
                    $('body').trigger('update_checkout');
                }
            });
        });
    });
    </script>
    <?php
}
 
// Add Radio Choice to Session
// Uses Ajax
 
add_action( 'wp_ajax_woo_get_ajax_data', 'ca_checkout_radio_choice_set_session' );
add_action( 'wp_ajax_nopriv_woo_get_ajax_data', 'ca_checkout_radio_choice_set_session' );
function ca_checkout_radio_choice_set_session() {
    if ( isset($_POST['radio']) ){
        $radio = sanitize_key( $_POST['radio'] );
        WC()->session->set('radio_chosen', $radio );
        echo json_encode( $radio );
    }
    die();
}