diff --git a/AsynchronousBerantai.js b/AsynchronousBerantai.js
new file mode 100644
index 0000000..43d523a
--- /dev/null
+++ b/AsynchronousBerantai.js
@@ -0,0 +1,18 @@
+const { buyTollRoadCard, topUpBalance, useTollRoad } = require('./utils');
+
+async function getTollAccess() 
+{
+  try 
+  {
+    const buy = await buyTollRoadCard(25);
+    const topUp = await topUpBalance(buy, 10);
+    const use = await useTollRoad(topUp);
+  }
+  
+  catch(error)
+  {
+    console.log(error.message);
+  }
+}
+
+getTollAccess();
diff --git a/Promise-Based.js b/Promise-Based.js
new file mode 100644
index 0000000..10e9f93
--- /dev/null
+++ b/Promise-Based.js
@@ -0,0 +1,29 @@
+const {promisify} = require('util');
+
+function getProvinces(countryId, callback)
+{
+  setTimeout(() =>
+  {
+    if (countryId === 'id') 
+    {
+      callback(null,
+      [
+        { id: 'id-jk', name: 'Jakarta' },
+        { id: 'id-bt', name: 'Banten' },
+        { id: 'id-jr', name: 'Jawa Barat' },
+      ]);
+      
+      return;
+    }
+
+  callback(new Error('Country not found'), null);
+  }, 1000);
+}
+
+const getProvincesPromise = promisify(getProvinces);
+
+getProvincesPromise('id')
+.then (Provinces => console.log(Provinces))
+.catch (err => console.log(err.message));
+
+module.exports = { getProvinces: getProvincesPromise};