Klarna for WooCommerce - filter the phone number returned from Klarna (KCO)

gistfile1.php

/**
 * WooCommerce - Klarna payment gateway
 * Filter the phone number returned from Klarna when customer pays via Klarna Checkout.
 * Useful when you want to add the country prefix to the phone number.
 *
 **/
 
add_filter('klarna_checkout_billing_phone', 'my_custom_klarna_checkout_billing_phone');
 
function my_custom_klarna_checkout_billing_phone( $phone_number ) {
	$country_code = '+47';
	$new_phone_number = $country_code . $phone_number;
	return $new_phone_number;
}