Shipping snippet for FoxyCart 2.0 International Shipping calculation. Currently not complete just has the conditional for GB and US. Twig templating language with JavaScript.

Foxy Shipping International

{% if context == 'cart' or context == 'checkout' %}
<script type="text/javascript" charset="utf-8">
(function (FC, $) {
    FC.customFlatRates = {};
    FC.customFlatRates.shipping_results = [];
 
    FC.customFlatRates.config = {
        'autoSelect': false  /* Set to true if you'd like the top shipping option to be automatically selected for the user */
    };
 
    FC.customFlatRates.logic = function(address) {
    /* BEGIN CUSTOM SHIPPING LOGIC */
    var shippingCost;
    var price = FC.json.total_item_price;
    if (address.country == "US") {
      //Code for shipping amounts based on the Two Letter Country Code
            if (price < 24.99) {
                shippingCost = 9.95;
            } else if (price >= 25 && price <= 49.99) {
                shippingCost = 11.95;
            } else if (price >= 50.00 && price <= 74.99) {
                shippingCost = 13.5;
            } else if(price >= 75 && price <= 99.99){
                shippingCost = 15.95;
            } else if(price >= 100 && price <= 199.99){
                shippingCost = 24.50;
            } else if(price >= 200 && price <= 299.99){
                shippingCost = 32.95;
            } else if(price >= 300 && price <= 399.99){
                shippingCost = 42.75;
            } else if(price >= 400 && price <= 499.99){
                shippingCost = 52.50;
            } else if(price >= 500 && price <= 599.99){
                shippingCost = 62.50;
            } else if(price >= 600 && price <= 699.99){
                shippingCost = 74.75;
            } else if(price >= 700 && price <= 799.99){
                shippingCost = 84.25;
            } else if(price >= 800 && price <= 899.99){
                shippingCost = 92.45;
            } else if(price >= 900 && price <= 999.99){
                shippingCost = 105.65;
            } else if(price >= 1000 && price <= 1249.99){
                shippingCost = 119.5;
            } else if(price >= 1250 && price <= 1499.99){
                shippingCost = 159.9;
            } else if(price >= 1500 && price <= 1749.99){
                shippingCost = 172.75;
            } else if(price >= 1750 && price <= 1999.99){
                shippingCost = 196.8;
            } else if(price >= 2000 && price <= 2499.99){
                shippingCost = 225;
            } else if(price >= 2500 && price <= 2999.99){
                shippingCost = 279;
            } else if(price >= 3000 && price <= 4999.99){
                shippingCost = 440.5;
            } else if(price >= 5000 && price <= 9999.99){
                shippingCost = 950;
            } else {
                shippingCost = 1075.60;
            }
    } else if(address.country == 'GB') {
      //Any other country code

    } else if(address.country === 'CN')
    /* END CUSTOM SHIPPING LOGIC */
    };
     FC.customFlatRates.add(1, shippingCost, '', 'Standard Shipping');
    //Hide other shipping options
    FC.client.on('render.done', function(params, next) {
        jQuery(".fc-checkout__section--shipping-results").hide();
    });
    /* Flat Rate Shipping Modification Logic v2.0.6 */
FC.customFlatRates.add=function(a,b,d,c){FC.customFlatRates.shipping_results.push({method:d,price:b,service_id:a,service_name:c})};FC.customFlatRates.hide=function(a){a=FC.customFlatRates.filterShippingOptions(a);for(var b=0;b<a.length;b++)FC.customFlatRates.shipping_results[a[b]].hide=!0};FC.customFlatRates.show=function(a){a=FC.customFlatRates.filterShippingOptions(a);for(var b=0;b<a.length;b++)FC.customFlatRates.shipping_results[a[b]].hide=!1};
    FC.customFlatRates.remove=function(a){a=FC.customFlatRates.filterShippingOptions(a);a=a.sort(function(a,b){return b-a});for(var b=a.length-1;0<=b;b--)FC.customFlatRates.shipping_results.splice(a[b],1)};
    FC.customFlatRates.update=function(a,b,d,c){a=FC.customFlatRates.filterShippingOptions(a);for(var e=0;e<a.length;e++){if("number"===typeof b||"string"===typeof b&&""!==b){var f=FC.customFlatRates.modifyPrice(FC.customFlatRates.shipping_results[a[e]].price,b);FC.customFlatRates.shipping_results[a[e]].price=f}"string"===typeof d&&(FC.customFlatRates.shipping_results[a[e]].method=d);"string"===typeof c&&(FC.customFlatRates.shipping_results[a[e]].service_name=c)}};
    FC.customFlatRates.reset=function(){FC.customFlatRates.shipping_results=[];FC.customFlatRates.error_message=!1};FC.customFlatRates.error=function(a){FC.customFlatRates.error_message=a};
    FC.api.getShippingOptions=function(a){var b={address_name:a.address_name,state:a.region,country:a.country,city:a.city,postal_code:a.postal_code};FC.customFlatRates.reset();FC.customFlatRates.logic(b);for(b=FC.customFlatRates.shipping_results.length-1;0<=b;b--)FC.customFlatRates.shipping_results[b].hide&&FC.customFlatRates.shipping_results.splice(b,1);if(FC.customFlatRates.config.autoSelect&&0==a.shipping_service_id||1==FC.customFlatRates.shipping_results.length){if(FC.json.has_multiship)for(b=0;b<
    FC.json.multiship_data.length;b++)FC.json.multiship_data[b].address_name==a.address_name&&(FC.json.multiship_data[b].shipping_service_id=FC.customFlatRates.shipping_results[0].service_id,FC.json.multiship_data[b].shipping_service_description=FC.customFlatRates.shipping_results[0].method+" "+FC.customFlatRates.shipping_results[0].service_name);else FC.json.shipping_address.shipping_service_id=FC.customFlatRates.shipping_results[0].service_id,FC.json.shipping_address.shipping_service_description=FC.customFlatRates.shipping_results[0].method+
    " "+FC.customFlatRates.shipping_results[0].service_name;FC.json.show_shipping_tbd=!1}return $.Deferred(function(a){setTimeout(function(){FC.customFlatRates.error_message?a.reject(Error(FC.customFlatRates.error_message)):a.resolve({ok:!0,data:{shipping_results:FC.customFlatRates.shipping_results}})},10)})};
    FC.customFlatRates.filterShippingOptions=function(a){if("number"==typeof a)for(var b=0;b<FC.customFlatRates.shipping_results.length;b++){if(FC.customFlatRates.shipping_results[b].service_id==a)return[b]}else{if("string"==typeof a){for(var d=[],c={},b=0;b<FC.customFlatRates.shipping_results.length;b++){var e=FC.customFlatRates.shipping_results[b];c[b]=e.method+" "+e.service_name}if("all"!=a.toLowerCase()){a=/(fedex|usps|ups)?\s?([\w\s]+)?/i.exec(a);if(void 0==a||""==a)return;for(b in c)void 0!=a[1]&&
    ""!=a[1]&&-1==c[b].toLowerCase().indexOf(a[1].toLowerCase())?delete c[b]:void 0!=a[2]&&""!=a[2]&&-1==c[b].toLowerCase().indexOf(a[2].toLowerCase())&&delete c[b]}for(b in c)d.push(parseInt(b));return d}if("object"==typeof a){d=[];for(b=0;b<a.length;b++)for(c=0;c<FC.customFlatRates.shipping_results.length;c++)FC.customFlatRates.shipping_results[c].service_id==a[b]&&d.push(a[b]);return d}}};
    FC.customFlatRates.modifyPrice=function(a,b){b=b.toString();var d=/([\+\-\=\*\/])?(\d+(?:\.\d+)?)(\%)?/.exec(b);a=parseFloat(a);var c=parseFloat(d[2]);void 0!=d[3]&&""!=d[3]&&(c=c/100*a);switch(void 0==d[1]&&""!=d[1]?"=":d[1]){case "+":a+=c;break;case "-":a-=c;break;case "/":a/=c;break;case "*":a*=c;break;default:a=c}return 0>a?0:a};
    function requireShipping(){if(!FC.json.shipping_address.has_live_rate_shippable_products){if(FC.json.has_multiship)for(i=0;i<FC.json.multiship_data.length;i++)FC.json.multiship_data[i].has_live_rate_shippable_products=!0,0==FC.json.multiship_data[i].shipping_service_id&&(FC.json.show_address_entry=!0,"cart"==FC.json.context&&(FC.json.show_shipping_tbd=!0));FC.json.shipping_address.has_live_rate_shippable_products=!0;FC.json.has_current_live_rate_shipping=!0;FC.json.has_current_flat_rate_shipping=
    !1;0==FC.json.shipping_address.shipping_service_id&&(FC.json.show_address_entry=!0,FC.json.show_shipping_tbd=!0);FC.Template(FC.json.context).clearOutput();FC[FC.json.context].render();$.each(FC.json.has_multiship?FC.json.multiship_data:[FC.json.shipping_address],function(a,b){FC.util.addressHasLocationInfo(b)&&0==b.shipping_results.length&&b.has_live_rate_shippable_products&&FC[FC.json.context].getShippingOptions({address:b})})}}FC.client.on("cart-item-quantity-update.done",requireShipping);
    FC.client.on("cart-item-remove.done",requireShipping);FC.client.on("cart-coupon-add.done",requireShipping);FC.client.on("cart-coupon-remove.done",requireShipping);FC.client.on("customer-login.done",requireShipping);FC.client.on("checkout-submit",requireShipping);
    {% if cart_is_fullpage or context == 'checkout' %}FC.client.on("ready.done",requireShipping);{% else %}requireShipping();{% endif %}
})(FC, jQuery);
</script>
{% endif %}