diff --git a/RNIapExample/android/app/build.gradle b/RNIapExample/android/app/build.gradle
index 56f2c21ef..3fc400a6d 100644
--- a/RNIapExample/android/app/build.gradle
+++ b/RNIapExample/android/app/build.gradle
@@ -94,7 +94,7 @@ def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 23
+    compileSdkVersion 27
     buildToolsVersion '27.0.3'
 
     defaultConfig {
@@ -137,11 +137,11 @@ android {
 }
 
 dependencies {
-    compile project(':react-native-gesture-handler')
-    compile project(':react-native-iap')
-    compile fileTree(dir: "libs", include: ["*.jar"])
-    compile "com.android.support:appcompat-v7:23.0.1"
-    compile "com.facebook.react:react-native:+"  // From node_modules
+    implementation project(':react-native-gesture-handler')
+    implementation project(':react-native-iap')
+    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation "com.android.support:appcompat-v7:27.0.3"
+    implementation "com.facebook.react:react-native:+"  // From node_modules
 
 }
 
diff --git a/android/src/main/java/com/dooboolab/RNIap/RNIapModule.java b/android/src/main/java/com/dooboolab/RNIap/RNIapModule.java
index e22c4477f..7caa565b5 100644
--- a/android/src/main/java/com/dooboolab/RNIap/RNIapModule.java
+++ b/android/src/main/java/com/dooboolab/RNIap/RNIapModule.java
@@ -66,7 +66,9 @@ public class RNIapModule extends ReactContextBaseJavaModule {
   private IInAppBillingService mService;
   private BillingClient mBillingClient;
 
-  ServiceConnection mServiceConn = new ServiceConnection() {
+  private boolean clientReady = false;
+
+  private ServiceConnection mServiceConn = new ServiceConnection() {
     @Override public void onServiceDisconnected(ComponentName name) {
       mService = null;
     }
@@ -76,7 +78,7 @@ public void onServiceConnected(ComponentName name, IBinder service) {
     }
   };
 
-  LifecycleEventListener lifecycleEventListener = new LifecycleEventListener() {
+  private LifecycleEventListener lifecycleEventListener = new LifecycleEventListener() {
     @Override
     public void onHostResume() {
 
@@ -100,7 +102,7 @@ public void onHostDestroy() {
     }
   };
 
-  public RNIapModule(ReactApplicationContext reactContext) {
+  private RNIapModule(ReactApplicationContext reactContext) {
     super(reactContext);
     this.reactContext = reactContext;
     reactContext.addLifecycleEventListener(lifecycleEventListener);
@@ -116,12 +118,13 @@ private void ensureConnection (final Promise promise, final Runnable callback) {
     // This is the key line that fixed everything for me
     intent.setPackage("com.android.vending");
 
-    BillingClientStateListener billingClientStateListener = new BillingClientStateListener() {
+    final BillingClientStateListener billingClientStateListener = new BillingClientStateListener() {
       @Override
       public void onBillingSetupFinished(@BillingClient.BillingResponse int responseCode) {
-        if (responseCode == BillingClient.BillingResponse.OK) {
+        if (responseCode == BillingClient.BillingResponse.OK && !clientReady) {
           Log.d(TAG, "billing client ready");
           callback.run();
+          clientReady = true;
         } else {
           rejectPromiseWithBillingError(promise, responseCode);
         }
@@ -130,6 +133,7 @@ public void onBillingSetupFinished(@BillingClient.BillingResponse int responseCo
       @Override
       public void onBillingServiceDisconnected() {
         Log.d(TAG, "billing client disconnected");
+        clientReady = false;
       }
     };
 
diff --git a/package.json b/package.json
index 9494b63b5..b0df17e7f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-native-iap",
-  "version": "2.4.0-betal",
+  "version": "2.4.0-beta2",
   "description": "React Native In App Purchase Module.",
   "main": "index.js",
   "types": "index.d.ts",