Code-Snippets-Functions/Execute a function on a child site/WooCommerce/sales-by-coupon-admin-coupon-list.txt

// Add a Header
function filter_manage_edit_shop_coupon_columns( $columns ) {   
    // Add new column
    $columns['total_sales'] = __( 'Total sales', 'woocommerce' );

    return $columns;
}
add_filter( 'manage_edit-shop_coupon_columns', 'filter_manage_edit_shop_coupon_columns', 10, 1 );

// Populate the Column
function action_manage_shop_coupon_posts_custom_column( $column, $post_id ) {
    // Compare
    if ( $column == 'total_sales' ) {
        // Get ALL orders with certain status
        // NOTE THE USE OF WC-.. at the order status
        $orders = wc_get_orders( array(
            'status' => array( 'wc-processing', 'wc-completed', 'wc-on-hold' ),
        ));
        
        // NOT empty
        if ( sizeof( $orders ) > 0 ) {      
            // Set variable
            $total = 0;
            
            // Iterating through each order
            foreach ( $orders as $order ) {         
                // Loop through WC_Order_Item_Coupon objects
                foreach ( $order->get_used_coupons() as $coupon_code ) {
                    // Retrieving the coupon ID
                    $coupon_post_obj = get_page_by_title( $coupon_code, OBJECT, 'shop_coupon' );
                    $coupon_id       = $coupon_post_obj->ID;                    
                    
                    // Compare
                    if ( $coupon_id == $post_id ) {
                        // Add to total
                        $total += $order->get_total();
                    }
                }
            }
            
            // Output
            echo wc_price( $total );
        }
    }
}
add_action( 'manage_shop_coupon_posts_custom_column' , 'action_manage_shop_coupon_posts_custom_column', 10, 2 );