Android: потребляйте продукт после покупки (выставление счетов в приложении)

У меня проблемы с биллингом приложений, я хотел создать внутри приложения продукт, который можно было бы покупать несколько раз. Но Google сделал биллинг в приложении таким образом, чтобы продукт сначала нужно было использовать, прежде чем вы сможете его снова купить. Я пробовал это со следующим кодом:

public class HomeFragment extends Fragment {

    private WebView homesite;
    private String homeTabUrl;
    private ProgressBar pBar;
    private Bundle webViewBundle;
    private Boolean buddyProfile = false;
    private Boolean buddyProfile2 = false;
    String url="";

    private Context mContext;
    final static String REQUEST_SUCCESS = "COMPLETED";


    //Amount point
    private static final int CREDIT_AMOUNT_100 = 100;
    private static final int CREDIT_AMOUNT_500 = 500;

    public static final String PAY_UID_100 = "messages";
    public static final String PAY_UID_500 = "messages2";


    private int mCreditAmount;
    private IabHelper mHelper;

    private static final int PAYINAPP_REQUESTCODE = 10001;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
        setRetainInstance(true);
        StaticMembers.loadHomeTab = true;

        purchaseCredit(CREDIT_AMOUNT_100);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        //Logger.error("YES-HERE IN ONACTIVITY RESULT");
        if (checkReultPayInApp(requestCode,resultCode, data)) {
            return;
        }

        if (!mHelper.handleActivityResult(requestCode, resultCode, data)) {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
    }



    private void loadData(View v) {
        initPayinApp();
    }

    private void initPayinApp() {
        // TODO Auto-generated method stub
        String base64EncodedPublicKey = "n9goJ2waiwGS3F0E+XpjlMJRnn6rKtaH3lWxGUZQjNJeAAdL78mFeUTAGaZLgX/YOIuERWL5IzLaTXNi69c60oeh489wi3lyGtWbNvXR5EXVNhazti2mZgwvjhUdzW7/73mV0rHZn0f24G3Dpy0zLaTXNi69c60oeh489wi3lyGtWbNvXR5EXVNhazti2mZgwvjhUdzW7/73mV0rHZn0f24G3Dpy0wkIFWt51OnnusIVlJHrwJ8dYz4mUZ6SLFhkXL8NhrRAcZKvUV3WySB55SA5uu1+IoGG7mJw0QPn9goJ2waiwGS3F0E+XpjlMJRnn6rKtaH3lWxGUZQjNJeAAdL78mFeUTAGaZLgX/YOIuERWL5I7uInsqWH+ny1HFDr2wIDAQAB";

        mHelper = new IabHelper(getActivity(), base64EncodedPublicKey);

        mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
            public void onIabSetupFinished(IabResult result) {
                if (!result.isSuccess()) {
                    Log.d("YES", "In-app Billing setup failed: " + result);
                } else {
                    Log.d("YES", "In-app Billing is set up OK");
                }
            }
        });
    }

    IabHelper.OnConsumeFinishedListener mConsumeFinishedListener =
            new IabHelper.OnConsumeFinishedListener() {
                public void onConsumeFinished(Purchase purchase, IabResult result) {
                    Logger.error("YES- Only in consume Listener");
                    if (result.isSuccess()) {

                        Logger.error("YES-in success consume Listener");
                    }
                    else {
                        Logger.error("YES-!in success consume Listener");
                    }
                }
            };


    IabHelper.OnIabPurchaseFinishedListener mPurchaseFinishedListener
            = new IabHelper.OnIabPurchaseFinishedListener() {
        public void onIabPurchaseFinished(IabResult result, Purchase purchase)
        {
            Logger.error("YES-IN SUCCESS: " + result.getMessage());
            if (result.isFailure()) {
                Logger.error("YES-"+result.getMessage());
                return;
            }
           else if (purchase.getSku().equals(PAY_UID_100)) {

                Logger.error("YES-100 purchased");
                // remove query inventory method from here and put consumeAsync() directly
                Toast.makeText(getActivity(), "100 points added successfully", Toast.LENGTH_SHORT).show();
                mHelper.consumeAsync(purchase, mConsumeFinishedListener);

            } else if ( purchase.getSku().equals(PAY_UID_500)) {
                Toast.makeText(getActivity(), "500 points added successfully", Toast.LENGTH_SHORT).show();
                Logger.error("YES-500 purchased");
                mHelper.consumeAsync(purchase, mConsumeFinishedListener);
            }

        }
    };

    private void purchaseCredit(int creditAmount) {
        mCreditAmount = creditAmount;
        try {
            if (mHelper != null) mHelper.flagEndAsync();
            mHelper.launchPurchaseFlow(getActivity(), getIdPayInAppByAmount(creditAmount), PAYINAPP_REQUESTCODE,
                    mPurchaseFinishedListener, "mypurchasetoken");
        } catch (Exception e) {
            Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_SHORT).show();
        }

    }

    protected String getIdPayInAppByAmount(int creditAmount) {
        switch (creditAmount) {
            case CREDIT_AMOUNT_100:
                return PAY_UID_100;
            case CREDIT_AMOUNT_500:
                return PAY_UID_500;
        }
        return null;
    }

    private boolean checkReultPayInApp(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        if (requestCode!= PAYINAPP_REQUESTCODE) {
            return false;
        }

        int responseCode = data.getIntExtra("RESPONSE_CODE", 0);
        String purchaseData = data.getStringExtra("INAPP_PURCHASE_DATA");
        String dataSignature = data.getStringExtra("INAPP_DATA_SIGNATURE");

        if (resultCode == Activity.RESULT_OK) {
            // Purchased Status = Purchased
            try {
                // Product Details JSON
                JSONObject jo = new JSONObject(purchaseData);
                // Purchased Product ID
                String sku = jo.getString("productId");
                addCredit(mCreditAmount);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else {

        }

        return true;
    }

    public void addCredit(final int creditAmount) {
        TaskPost.depositPoint(getActivity(), new User().getEmail(), creditAmount, new MyHttpClient.OnRequestListener() {

            public void OnStart() {
                // TODO Auto-generated method stub
            }

            @Override
            public void OnFinish(String result) {
                if (result.equalsIgnoreCase(REQUEST_SUCCESS)) {
                    Toast.makeText(mContext,"You have just add " + creditAmount+ " success to your account",Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}

Пожалуйста, дайте мне знать, что я делаю неправильно, потребляя продукт, чтобы я мог внести соответствующие изменения.