public static function checkCurrency($country, $currency)
    {
        switch($country) {
        case KlarnaCountry::AT:
        case KlarnaCountry::DE:
        case KlarnaCountry::NL:
        case KlarnaCountry::FI:
            return ($currency === KlarnaCurrency::EUR);
        case KlarnaCountry::DK:
            return ($currency === KlarnaCurrency::DKK);
        case KlarnaCountry::NO:
            return ($currency === KlarnaCurrency::NOK);
        case KlarnaCountry::SE:
            return ($currency === KlarnaCurrency::SEK);
        default:
            //Country not yet supported by Klarna.
            return false;
        }
    }