Currency conversion for Shopify

<script>
 (function () {
     function convertToDefaultCurrency(amount, fromCurrency, precision = 2) {
       var defaultCurrency = "USD";

       var currencyConversion = {
           "USD": 1,       // Always keep the default store currency in the array
           "EUR": 1.1,     // Euro
           "GBP": 0.82,    // Great British Pound
           "AUD": 1.43,    // Australian Dollar
           "CAD": 1.4,     // Canadian Dollar
           "CZK": 26,      // Czech Koruna
           "DKK": 7.3,     // Danish Kroner
           "HKD": 7.76,    // Hong Kong Dollar
           "ISK": 170,     // Icelandic Krona
           "ILS": 3.8,     // Israeli New Shekel
           "NZD": 1.43,    // New Zealand Dollar
           "NOK": 14,      // Norwegian Kroner
           "PLN": 4.6,     // Polish Zloty
           "RON": 5,       // Romanian Leu
           "SGD": 1.34,    // Singaporean Dollar
           "KRW": 1200,    // South Korean Won
           "SEK": 10.55,   // Swedish Krona
           "JPY": 120,     // Japanese Yen
       };

       if (!currencyConversion[fromCurrency.toUpperCase()]) {
         console.error("Unsupported currency code: {{ currency }}"); 
         return null;
       }
       return (amount / currencyConversion[fromCurrency.toUpperCase()]).toFixed(precision);
     }

     // Example usage:
     {% assign _vis_opt_revenue = total_price | divided_by: 100.0 %}
     var revenue = {{ _vis_opt_revenue }};
     var currency = "{{ currency }}";
     var convertedAmount = convertToDefaultCurrency(revenue, currency);
   
     // Do not change anything in the following two lines

     window.VWO = window.VWO || [];
     VWO.event = VWO.event || function () {VWO.push(["event"].concat([].slice.call(arguments)))};
    
     VWO.event("purchase", {
       "revenue": convertedAmount || revenue,
       "currency": currency
     });
 })();
</script>