docs/html/google/play/billing/billing_integrate.jd

page.title=Implementing In-app Billing
parent.title=In-app Billing
parent.link=index.html
page.tags="inapp, billing, iap"
@jd:body

<div id="qv-wrapper">
<div id="qv">
  <h2>In this document</h2>
  <ol>
    <li><a href="#billing-add-aidl">Adding the AIDL file</a></li>
    <li><a href="#billing-permission">Updating Your Manifest</a></li>
    <li><a href="#billing-service">Creating a ServiceConnection</a></li>
    <li><a href="#billing-requests">Making In-app Billing Requests</a>
       <ol>
       <li><a href="#QueryDetails">Querying Items Available for Purchase</a><li>
       <li><a href="#Purchase">Purchasing an Item</a></li>
       <li><a href="#QueryPurchases">Querying Purchased Items</a></li>
       <li><a href="#Consume">Consuming a Purchase</a></li>
       <li><a href="#Subs">Implementing Subscriptions</a></li>
       </ol>
    </li>
    <li><a href="#billing-security">Securing Your App</a>
  </ol>
  <h2>Reference</h2>
  <ol>
    <li><a href="{@docRoot}google/play/billing/billing_reference.html">In-app Billing
    Reference (V3)</a></li>
  </ol>
  <h2>Related Samples</h2>
  <ol>
    <li><a href="{@docRoot}training/in-app-billing/preparing-iab-app.html#GetSample">Sample Application (V3)</a></li>
  </ol>
  <h2>See also</h2>
  <ol>
    <li><a href="{@docRoot}training/in-app-billing/index.html">Selling In-app Products</a></li>
  </ol>
</div>
</div>

<p>
  In-app Billing on Google Play provides a straightforward, simple interface
  for sending In-app Billing requests and managing In-app Billing transactions
  using Google Play. The information below covers the basics of how to make
  calls from your application to the In-app Billing service using the Version 3
  API.
</p>

<p class="note">
  <strong>Note:</strong> To see a complete implementation and learn how to test
  your application, see the <a href=
  "{@docRoot}training/in-app-billing/index.html">Selling In-app Products</a>
  training class. The training class provides a complete sample In-app Billing
  application, including convenience classes to handle key tasks related to
  setting up your connection, sending billing requests and processing responses
  from Google Play, and managing background threading so that you can make
  In-app Billing calls from your main activity.
</p>

<p>
  Before you start, be sure that you read the <a href=
  "{@docRoot}google/play/billing/billing_overview.html">In-app Billing
  Overview</a> to familiarize yourself with concepts that will make it easier
  for you to implement In-app Billing.
</p>

<p>To implement In-app Billing in your application, you need to do the
following:</p>

<ol>
  <li>Add the In-app Billing library to your project.</li>
  <li>Update your {@code AndroidManifest.xml} file.</li>
  <li>Create a {@code ServiceConnection} and bind it to
{@code IInAppBillingService}.</li>
  <li>Send In-app Billing requests from your application to
{@code IInAppBillingService}.</li>
  <li>Handle In-app Billing responses from Google Play.</li>
</ol>

<h2 id="billing-add-aidl">Adding the AIDL file to your project</h2>

<p>{@code IInAppBillingService.aidl} is an Android Interface Definition
Language (AIDL) file that defines the interface to the In-app Billing Version
3 service. You will use this interface to make billing requests by invoking IPC
method calls.</p>
<p>To get the AIDL file:</p>
<ol>
<li>Open the <a href="{@docRoot}tools/help/sdk-manager.html">Android SDK Manager</a>.</li>
<li>In the SDK Manager, expand the {@code Extras} section.</li>
<li>Select <strong>Google Play Billing Library</strong>.</li>
<li>Click <strong>Install packages</strong> to complete the download.</li>
</ol>
<p>The {@code IInAppBillingService.aidl} file will be installed to {@code <sdk>/extras/google/play_billing/}.</p>

<p>To add the AIDL to your project:</p>

<ol>
  <li>First, download the Google Play Billing Library to your Android project:
      <ol type="a">
      <li>Select <strong>Tools > Android > SDK Manager</strong>.</li>
      <li>Under <strong>Appearance & Behavior > System Settings > Android SDK</strong>,
          select the <em>SDK Tools</em> tab to select and download <em>Google Play Billing
          Library</em>.</li></ol>

  <li>Next, copy the {@code IInAppBillingService.aidl} file to your project.
    <ul>
      <li>If you are using Android Studio:
        <ol type="a">
          <li>Navigate to {@code src/main} in the Project tool window.</li>

          <li>Select <strong>File > New > Directory</strong> and enter {@code aidl} in the
          <em>New Directory</em> window, then select <strong>OK</strong>.

          <li>Select <strong>File > New > Package</strong> and enter
          {@code com.android.vending.billing} in the <em>New Package</em> window, then select
          <strong>OK</strong>.</li>

          <li>Using your operating system file explorer, navigate to
          {@code <sdk>/extras/google/play_billing/}, copy the
          {@code IInAppBillingService.aidl} file, and paste it into the
          {@code com.android.vending.billing} package in your project.
          </li>
        </ol>
      </li>

      <li>If you are developing in a non-Android Studio environment: Create the
      following directory {@code /src/com/android/vending/billing} and copy the
      {@code IInAppBillingService.aidl} file into this directory. Put the AIDL
      file into your project and use the Gradle tool to build your project so that
      the <code>IInAppBillingService.java</code> file gets generated.
      </li>
    </ul>
  </li>

  <li>Build your application. You should see a generated file named {@code
  IInAppBillingService.java} in the {@code /gen} directory of your project.
  </li>
</ol>

<h2 id="billing-permission">Updating Your App's Manifest</h2>

<p>
  In-app billing relies on the Google Play application, which handles all
  communication between your application and the Google Play server. To use the
  Google Play application, your application must request the proper permission.
  You can do this by adding the {@code com.android.vending.BILLING} permission
  to your AndroidManifest.xml file. If your application does not declare the
  In-app Billing permission, but attempts to send billing requests, Google Play
  will refuse the requests and respond with an error.
</p>

<p>
  To give your app the necessary permission, add this line in the {@code
  AndroidManifest.xml} file:
</p>

<pre>
&lt;uses-permission android:name="com.android.vending.BILLING" /&gt;
</pre>

<h2 id="billing-service">Creating a ServiceConnection</h2>

<p>
  Your application must have a {@link android.content.ServiceConnection} to
  facilitate messaging between your application and Google Play. At a minimum,
  your application must do the following:
</p>

<ul>
  <li>Bind to {@code IInAppBillingService}.
  <li>Send billing requests (as IPC method calls) to the Google Play application.</li>
  <li>Handle the synchronous response messages that are returned with each billing request.</li>
</ul>

<h3>Binding to IInAppBillingService</h3>

<p>
  To establish a connection with the In-app Billing service on Google Play,
  implement a {@link android.content.ServiceConnection} to bind your activity
  to {@code IInAppBillingService}. Override the {@link
  android.content.ServiceConnection#onServiceDisconnected
  onServiceDisconnected} and {@link
  android.content.ServiceConnection#onServiceConnected onServiceConnected}
  methods to get a reference to the {@code IInAppBillingService} instance after
  a connection has been established.
</p>

<pre>
IInAppBillingService mService;

ServiceConnection mServiceConn = new ServiceConnection() {
   &#64;Override
   public void onServiceDisconnected(ComponentName name) {
       mService = null;
   }

   &#64;Override
   public void onServiceConnected(ComponentName name,
      IBinder service) {
       mService = IInAppBillingService.Stub.asInterface(service);
   }
};
</pre>

<p>
  In your activity’s {@link android.app.Activity#onCreate onCreate} method,
  perform the binding by calling the {@link android.content.Context#bindService
  bindService} method. Pass the method an {@link android.content.Intent} that
  references the In-app Billing service and an instance of the {@link
  android.content.ServiceConnection} that you created, and explicitly set the
  Intent's target package name to <code>com.android.vending</code> — the
  package name of Google Play app.
</p>

<p class="caution">
  <strong>Caution:</strong> To protect the security of billing transactions,
  always make sure to explicitly set the intent's target package name to
  <code>com.android.vending</code>, using {@link
  android.content.Intent#setPackage(java.lang.String) setPackage()} as shown in
  the example below. Setting the package name explicitly ensures that
  <em>only</em> the Google Play app can handle billing requests from your app,
  preventing other apps from intercepting those requests.
</p>

<pre>&#64;Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  Intent serviceIntent =
      new Intent("com.android.vending.billing.InAppBillingService.BIND");
  serviceIntent.setPackage("com.android.vending");
  bindService(serviceIntent, mServiceConn, Context.BIND_AUTO_CREATE);
}
</pre>

<p>
  You can now use the mService reference to communicate with the Google Play
  service.
</p>

<p class="note">
  <strong>Important:</strong> Remember to unbind from the In-app Billing
  service when you are done with your {@link android.app.Activity}. If you
  don’t unbind, the open service connection could cause your device’s
  performance to degrade. This example shows how to perform the unbind
  operation on a service connection to In-app Billing called {@code
  mServiceConn} by overriding the activity’s {@link
  android.app.Activity#onDestroy onDestroy} method.
</p>

<pre>
&#64;Override
public void onDestroy() {
    super.onDestroy();
    if (mService != null) {
        unbindService(mServiceConn);
    }
}
</pre>

<p>
  For a complete implementation of a service connection that binds to the
  {@code IInAppBillingService}, see the <a href=
  "{@docRoot}training/in-app-billing/preparing-iab-app.html">Selling In-app
  Products</a> training class and associated sample.
</p>
<h2 id="billing-requests">Making In-app Billing Requests</h2>
<p>
  Once your application is connected to Google Play, you can initiate purchase
  requests for in-app products. Google Play provides a checkout interface for
  users to enter their payment method, so your application does not need to
  handle payment transactions directly. When an item is purchased, Google Play
  recognizes that the user has ownership of that item and prevents the user
  from purchasing another item with the same product ID until it is consumed.
  You can control how the item is consumed in your application, and notify
  Google Play to make the item available for purchase again. You can also query
  Google Play to quickly retrieve the list of purchases that were made by the
  user. This is useful, for example, when you want to restore the user's
  purchases when your user launches your app.
</p>

<h3 id="QueryDetails">Querying for Items Available for Purchase</h3>

<p>
  In your application, you can query the item details from Google Play using
  the In-app Billing Version 3 API. To pass a request to the In-app Billing
  service, first create a {@link android.os.Bundle} that contains a String
  {@link java.util.ArrayList} of product IDs with key "ITEM_ID_LIST", where
  each string is a product ID for an purchasable item.
</p>

<pre>
ArrayList&lt;String&gt; skuList = new ArrayList&lt;String&gt; ();
skuList.add("premiumUpgrade");
skuList.add("gas");
Bundle querySkus = new Bundle();
querySkus.putStringArrayList("ITEM_ID_LIST", skuList);
</pre>

<p>
  To retrieve this information from Google Play, call the {@code getSkuDetails}
  method on the In-app Billing Version 3 API, and pass the method the In-app
  Billing API version (“3”), the package name of your calling app, the purchase
  type (“inapp”), and the {@link android.os.Bundle} that you created.
</p>

<pre>
Bundle skuDetails = mService.getSkuDetails(3,
   getPackageName(), "inapp", querySkus);
</pre>

<p>
  If the request is successful, the returned {@link android.os.Bundle}has a
  response code of {@code BILLING_RESPONSE_RESULT_OK} (0).
</p>

<p class="note">
  <strong>Warning:</strong> Do not call the {@code getSkuDetails} method on the
  main thread. Calling this method triggers a network request which could block
  your main thread. Instead, create a separate thread and call the {@code
  getSkuDetails} method from inside that thread.
</p>

<p>
  To see all the possible response codes from Google Play, see <a href=
  "{@docRoot}google/play/billing/billing_reference.html#billing-codes">In-app
  Billing Reference</a>.
</p>

<p>
  The query results are stored in a String ArrayList with key {@code
  DETAILS_LIST}. The purchase information is stored in the String in JSON
  format. To see the types of product detail information that are returned, see
  <a href=
  "{@docRoot}google/play/billing/billing_reference.html#getSkuDetails">In-app
  Billing Reference</a>.
</p>

<p>
  In this example, you are retrieving the prices for your in-app items from the
  skuDetails {@link android.os.Bundle} returned from the previous code snippet.
</p>

<pre>
int response = skuDetails.getInt("RESPONSE_CODE");
if (response == 0) {
   ArrayList&lt;String&gt; responseList
      = skuDetails.getStringArrayList("DETAILS_LIST");

   for (String thisResponse : responseList) {
      JSONObject object = new JSONObject(thisResponse);
      String sku = object.getString("productId");
      String price = object.getString("price");
      if (sku.equals("premiumUpgrade")) mPremiumUpgradePrice = price;
      else if (sku.equals("gas")) mGasPrice = price;
   }
}
</pre>

<h3 id="Purchase">Purchasing an Item</h3>
<p>
  To start a purchase request from your app, call the {@code getBuyIntent}
  method on the In-app Billing service. Pass in to the method the In-app
  Billing API version (“3”), the package name of your calling app, the product
  ID for the item to purchase, the purchase type (“inapp” or "subs"), and a
  {@code developerPayload} String. The {@code developerPayload} String is used
  to specify any additional arguments that you want Google Play to send back
  along with the purchase information.
</p>

<pre>
Bundle buyIntentBundle = mService.getBuyIntent(3, getPackageName(),
   sku, "inapp", "bGoa+V7g/yqDXvKRqq+JTFn4uQZbPiQJo4pf9RzJ");
</pre>

<p>
  If the request is successful, the returned {@link android.os.Bundle} has a
  response code of {@code BILLING_RESPONSE_RESULT_OK} (0) and a {@link
  android.app.PendingIntent} that you can use to start the purchase flow. To
  see all the possible response codes from Google Play, see <a href=
  "{@docRoot}google/play/billing/billing_reference.html#billing-codes">In-app
  Billing Reference</a>. Next, extract a {@link android.app.PendingIntent} from
  the response {@link android.os.Bundle} with key {@code BUY_INTENT}.
</p>

<pre>
PendingIntent pendingIntent = buyIntentBundle.getParcelable("BUY_INTENT");
</pre>

<p>
  To complete the purchase transaction, call the {@link
  android.app.Activity#startIntentSenderForResult startIntentSenderForResult}
  method and use the {@link android.app.PendingIntent} that you created. In
  this example, you are using an arbitrary value of 1001 for the request code.
</p>

<pre>
startIntentSenderForResult(pendingIntent.getIntentSender(),
   1001, new Intent(), Integer.valueOf(0), Integer.valueOf(0),
   Integer.valueOf(0));
</pre>

<p>
  Google Play sends a response to your {@link android.app.PendingIntent} to the
  {@link android.app.Activity#onActivityResult onActivityResult} method of your
  application. The {@link android.app.Activity#onActivityResult
  onActivityResult} method will have a result code of {@code
  Activity.RESULT_OK} (1) or {@code Activity.RESULT_CANCELED} (0). To see the
  types of order information that is returned in the response {@link
  android.content.Intent}, see <a href=
  "{@docRoot}google/play/billing/billing_reference.html#getBuyIntent">In-app
  Billing Reference</a>.
</p>

<p>
  The purchase data for the order is a String in JSON format that is mapped to
  the {@code INAPP_PURCHASE_DATA} key in the response {@link
  android.content.Intent}, for example:
</p>

<pre>
'{
   "orderId":"GPA.1234-5678-9012-34567",
   "packageName":"com.example.app",
   "productId":"exampleSku",
   "purchaseTime":1345678900000,
   "purchaseState":0,
   "developerPayload":"bGoa+V7g/yqDXvKRqq+JTFn4uQZbPiQJo4pf9RzJ",
   "purchaseToken":<em>"opaque-token-up-to-1000-characters"</em>
 }'
</pre>

<p class="note">
  <strong>Note:</strong> Google Play generates a token for the purchase. This
  token is an opaque character sequence that may be up to 1,000 characters
  long. Pass this entire token to other methods, such as when you consume the
  purchase, as described in <a href=
  "{@docRoot}training/in-app-billing/purchase-iab-products.html#Consume">Consume
  a Purchase</a>. Do not abbreviate or truncate this token; you must save and
  return the entire token.
</p>

<p>
  Continuing from the previous example, you get the response code, purchase
  data, and signature from the response {@link android.content.Intent}.
</p>

<pre>
&#64;Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
   if (requestCode == 1001) {
      int responseCode = data.getIntExtra("RESPONSE_CODE", 0);
      String purchaseData = data.getStringExtra("INAPP_PURCHASE_DATA");
      String dataSignature = data.getStringExtra("INAPP_DATA_SIGNATURE");

      if (resultCode == RESULT_OK) {
         try {
            JSONObject jo = new JSONObject(purchaseData);
            String sku = jo.getString("productId");
            alert("You have bought the " + sku + ". Excellent choice,
               adventurer!");
          }
          catch (JSONException e) {
             alert("Failed to parse purchase data.");
             e.printStackTrace();
          }
      }
   }
}
</pre>

<p class="note">
  <strong>Security Recommendation:</strong> When you send a purchase request,
  create a String token that uniquely identifies this purchase request and
  include this token in the {@code developerPayload}.You can use a randomly
  generated string as the token. When you receive the purchase response from
  Google Play, make sure to check the returned data signature, the {@code
  orderId}, and the {@code developerPayload} String. For added security, you
  should perform the checking on your own secure server. Make sure to verify
  that the {@code orderId} is a unique value that you have not previously
  processed, and the {@code developerPayload} String matches the token that you
  sent previously with the purchase request.
</p>

<h3 id="QueryPurchases">Querying for Purchased Items</h3>

<p>
  To retrieve information about purchases made by a user from your app, call
  the {@code getPurchases} method on the In-app Billing Version 3 service. Pass
  in to the method the In-app Billing API version (“3”), the package name of
  your calling app, and the purchase type (“inapp” or "subs").
</p>

<pre>
Bundle ownedItems = mService.getPurchases(3, getPackageName(), "inapp", null);
</pre>

<p>
  The Google Play service returns only the purchases made by the user account
  that is currently logged in to the device. If the request is successful, the
  returned {@link android.os.Bundle} has a response code of 0. The response
  {@link android.os.Bundle} also contains a list of the product IDs, a list of
  the order details for each purchase, and the signatures for each purchase.
</p>

<p>
  To improve performance, the In-app Billing service returns only up to 700
  products that are owned by the user when {@code getPurchase} is first called.
  If the user owns a large number of products, Google Play includes a String
  token mapped to the key {@code INAPP_CONTINUATION_TOKEN} in the response
  {@link android.os.Bundle} to indicate that more products can be retrieved.
  Your application can then make a subsequent {@code getPurchases} call, and
  pass in this token as an argument. Google Play continues to return a
  continuation token in the response {@link android.os.Bundle} until all
  products that are owned by the user has been sent to your app.
</p>

<p>For more information about the data returned by {@code getPurchases}, see
  <a href="{@docRoot}google/play/billing/billing_reference.html#getPurchases">
  In-app Billing Reference</a>. The following example shows how you can
  retrieve this data from the response.
</p>

<pre>
int response = ownedItems.getInt("RESPONSE_CODE");
if (response == 0) {
   ArrayList&lt;String&gt; ownedSkus =
      ownedItems.getStringArrayList("INAPP_PURCHASE_ITEM_LIST");
   ArrayList&lt;String&gt;  purchaseDataList =
      ownedItems.getStringArrayList("INAPP_PURCHASE_DATA_LIST");
   ArrayList&lt;String&gt;  signatureList =
      ownedItems.getStringArrayList("INAPP_DATA_SIGNATURE_LIST");
   String continuationToken =
      ownedItems.getString("INAPP_CONTINUATION_TOKEN");

   for (int i = 0; i &lt; purchaseDataList.size(); ++i) {
      String purchaseData = purchaseDataList.get(i);
      String signature = signatureList.get(i);
      String sku = ownedSkus.get(i);

      // do something with this purchase information
      // e.g. display the updated list of products owned by user
   }

   // if continuationToken != null, call getPurchases again
   // and pass in the token to retrieve more items
}
</pre>


<h3 id="Consume">Consuming a Purchase</h3>

<p>
  You can use the In-app Billing Version 3 API to track the ownership of
  purchased in-app products in Google Play. Once an in-app product is
  purchased, it is considered to be "owned" and cannot be purchased from Google
  Play. You must send a consumption request for the in-app product before
  Google Play makes it available for purchase again.
</p>

<p class="caution">
  <strong>Important</strong>: Managed in-app products are consumable, but
  subscriptions are not.
</p>

<p>
  How you use the consumption mechanism in your app is up to you. Typically,
  you would implement consumption for in-app products with temporary benefits
  that users may want to purchase multiple times (for example, in-game currency
  or equipment). You would typically not want to implement consumption for
  in-app products that are purchased once and provide a permanent effect (for
  example, a premium upgrade).
</p>

<p>
  To record a purchase consumption, send the {@code consumePurchase} method to
  the In-app Billing service and pass in the {@code purchaseToken} String value
  that identifies the purchase to be removed. The {@code purchaseToken} is part
  of the data returned in the {@code INAPP_PURCHASE_DATA} String by the Google
  Play service following a successful purchase request. In this example, you
  are recording the consumption of a product that is identified with the {@code
  purchaseToken} in the {@code token} variable.
</p>

<pre>
int response = mService.consumePurchase(3, getPackageName(), token);
</pre>

<p class="note">
  <strong>Warning:</strong> Do not call the {@code consumePurchase} method on
  the main thread. Calling this method triggers a network request which could
  block your main thread. Instead, create a separate thread and call the {@code
  consumePurchase} method from inside that thread.
</p>

<p>
  It's your responsibility to control and track how the in-app product is
  provisioned to the user. For example, if the user purchased in-game currency,
  you should update the player's inventory with the amount of currency
  purchased.
</p>

<p class="note">
  <strong>Security Recommendation:</strong> You must send a consumption request
  before provisioning the benefit of the consumable in-app purchase to the
  user. Make sure that you have received a successful consumption response from
  Google Play before you provision the item.
</p>

<h3 id="Subs">Implementing Subscriptions</h3>

<p>Launching a purchase flow for a subscription is similar to launching the
purchase flow for a product, with the exception that the product type must be set
to "subs". The purchase result is delivered to your Activity's
{@link android.app.Activity#onActivityResult onActivityResult} method, exactly
as in the case of in-app products.</p>

<pre>
Bundle bundle = mService.getBuyIntent(3, "com.example.myapp",
   MY_SKU, "subs", developerPayload);

PendingIntent pendingIntent = bundle.getParcelable(RESPONSE_BUY_INTENT);
if (bundle.getInt(RESPONSE_CODE) == BILLING_RESPONSE_RESULT_OK) {
   // Start purchase flow (this brings up the Google Play UI).
   // Result will be delivered through onActivityResult().
   startIntentSenderForResult(pendingIntent, RC_BUY, new Intent(),
       Integer.valueOf(0), Integer.valueOf(0), Integer.valueOf(0));
}
</pre>

<p>To query for active subscriptions, use the {@code getPurchases} method, again
with the product type parameter set to "subs".</p>

<pre>
Bundle activeSubs = mService.getPurchases(3, "com.example.myapp",
                   "subs", continueToken);
</pre>

<p>The call returns a {@code Bundle} with all the active subscriptions owned by
the user. Once a subscription expires without renewal, it will no longer appear
in the returned {@code Bundle}.</p>

<h2 id="billing-security">Securing Your Application</h2>

<p>To help ensure the integrity of the transaction information that is sent to
your application, Google Play signs the JSON string that contains the response
data for a purchase order. Google Play uses the private key that is associated
with your application in the Developer Console to create this signature. The
Developer Console generates an RSA key pair for each application.<p>

<p class="note"><strong>Note:</strong>To find the public key portion of this key
pair, open your application's details in the Developer Console, then click on
<strong>Services &amp; APIs</strong>, and look at the field titled
<strong>Your License Key for This Application</strong>.</p>

<p>The Base64-encoded RSA public key generated by Google Play is in binary
encoded, X.509 subjectPublicKeyInfo DER SEQUENCE format. It is the same public
key that is used with Google Play licensing.</p>

<p>When your application receives this signed response you can
use the public key portion of your RSA key pair to verify the signature.
By performing signature verification you can detect responses that have
been tampered with or that have been spoofed. You can perform this signature
verification step in your application; however, if your application connects
to a secure remote server then we recommend that you perform the signature
verification on that server.</p>

<p>For more information about best practices for security and design, see <a
href="{@docRoot}google/play/billing/billing_best_practices.html">Security and
Design</a>.</p>