diff --git a/main.cpp b/main.cpp
index 920f43f..7f2a619 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,3 +1,4 @@
+#define _CRT_SECURE_NO_WARNINGS
 #include <iostream>
 #include <string>
 #include <cpprest/http_client.h>
@@ -17,21 +18,24 @@ pplx::task<http_response> validate_license_key(http_client client, const string
   http_request req;
 
   value meta;
-  meta["key"] = value::string(license_key);
+  meta[utility::conversions::to_string_t("key")] = value::string(utility::conversions::to_string_t(license_key));
 
   value body;
-  body["meta"] = meta;
+  body[utility::conversions::to_string_t("meta")] = meta;
 
-  req.headers().add("Content-Type", "application/vnd.api+json");
-  req.headers().add("Accept", "application/json");
+  req.headers().add(utility::conversions::to_string_t("Content-Type"), utility::conversions::to_string_t("application/vnd.api+json"));
+  req.headers().add(utility::conversions::to_string_t("Accept"), utility::conversions::to_string_t("application/json"));
 
-  req.set_request_uri(uri("/licenses/actions/validate-key"));
+  req.set_request_uri(uri(utility::conversions::to_string_t("/licenses/actions/validate-key")));
   req.set_method(methods::POST);
   req.set_body(body.serialize());
 
   return client.request(req);
 }
 
+// Usage:
+// 1. Change KEYGEN_ACCOUNT_ID to your personal value
+// 2. Call the compiled file with a valid licence key
 int main(int argc, char* argv[])
 {
   if (argc == 1)
@@ -45,43 +49,43 @@ int main(int argc, char* argv[])
 
   string account_id = getenv("KEYGEN_ACCOUNT_ID");
   string license_key = argv[1];
-  http_client client(uri("https://api.keygen.sh/v1/accounts/" + account_id));
+  http_client client(uri(utility::conversions::to_string_t("https://api.keygen.sh/v1/accounts/") + utility::conversions::to_string_t(account_id)));
 
   validate_license_key(client, license_key)
     .then([](http_response res)
     {
       auto json = res.extract_json().get();
-      if (json.has_field("errors"))
+      if (json.has_field(utility::conversions::to_string_t("errors")))
       {
-        auto errors = json.at("errors").as_array();
+        auto errors = json.at(utility::conversions::to_string_t("errors")).as_array();
         auto err = errors[0];
 
         cerr << "[ERROR] "
              << "API request failed: "
              << "status=" << res.status_code() << " "
-             << "title='" << err.at("title").as_string() << "' "
-             << "detail='" << err.at("detail").as_string() << "'"
+             << "title='" << err.at(utility::conversions::to_string_t("title")).as_string().c_str() << "' "
+             << "detail='" << err.at(utility::conversions::to_string_t("detail")).as_string().c_str() << "'"
              << endl;
 
         exit(1);
       }
 
-      auto data = json.at("data");
-      auto meta = json.at("meta");
+      auto data = json.at(utility::conversions::to_string_t("data"));
+      auto meta = json.at(utility::conversions::to_string_t("meta"));
 
-      if (meta.at("valid").as_bool())
+      if (meta.at(utility::conversions::to_string_t("valid")).as_bool())
       {
         cout << "[OK] "
              << "License key is valid: "
-             << "code=" << meta.at("code").as_string() << " "
-             << "id=" << data.at("id").as_string()
+             << "code=" << meta.at(utility::conversions::to_string_t("code")).as_string().c_str() << " "
+             << "id=" << data.at(utility::conversions::to_string_t("id")).as_string().c_str()
              << endl;
       }
       else
       {
         cerr << "[ERROR] "
              << "License key is not valid: "
-             << "code=" << meta.at("code").as_string()
+             << "code=" << meta.at(utility::conversions::to_string_t("code")).as_string().c_str()
              << endl;
       }
     })