Woocommerce change prices for a certain country [closed]

You need to use the woocommerce_get_price filter:

add_filter('woocommerce_get_price', 'return_custom_price', $product, 2);

function return_custom_price($price, $product) {    
    global $post, $woocommerce;
    // Array containing country codes
    $county = array('CH');
    // Amount to increase by
    $amount = 5;
    // If the custromers shipping country is in the array
    if ( in_array( $woocommerce->customer->get_shipping_country(), $county ) ){
        // Return the price plus the $amount
       return $new_price = $price + $amount;
    } else {
        // Otherwise just return the normal price
        return $price;
    }
} 

---

EDIT:

To do this for just one product you can simply run a check on the product id via $post:

add_filter('woocommerce_get_price', 'return_custom_price', $product, 2);

function return_custom_price($price, $product) {    
    global $post, $woocommerce;
    // Array containing country codes
    $county = array('CH');
    // Get the post id 
    $post_id = $post->ID;
    // Amount to increase by
    $amount = 5;
    // If the customers shipping country is in the array and the post id matches
    if ( in_array( $woocommerce->customer->get_shipping_country(), $county ) && ( $post_id == '12' || $post_id == '5' || $post_id == '6' ) ){
        // Return the price plus the $amount
       return $new_price = $price + $amount;
    } else {
        // Otherwise just return the normal price
        return $price;
    }
} 

Simply replace the ’12’ with your desired product ID. (‘5’ and ‘6’ are the checkout pages respectively)