پرداخت درون برنامه ای بازار

دو تا کد زیر زا در کلاس G قرار بده

public static boolean prepareBazaarInAppBilling(final boolean requireUpdatePrefrences,final IabHelper.QueryInventoryFinishedListener mGotInventoryListener) {
  try {
    mHelper = new IabHelper(G.context, base64EncodedPublicKey);
    Log.d(TAG, "Starting setup.");
    IabHelper.OnIabSetupFinishedListener listener =
      new IabHelper.OnIabSetupFinishedListener() {

        public void onIabSetupFinished(IabResult result) {
          Log.d(TAG, "Setup finished.");
          if ( !result.isSuccess()) {
            Log.d(TAG, "Problem setting up In-app Billing: " + result);
          }
          if (requireUpdatePrefrences && mGotInventoryListener != null) {
            mHelper.queryInventoryAsync(mGotInventoryListener);
          }
        }
      };
    mHelper.startSetup(listener);
    return true;
  }
  catch (Exception e) {
    e.printStackTrace();
    return false;
  }
}


///////

public static void setPremiumState(boolean state) {
  SharedPreferences.Editor editor = preferences.edit();
  editor.putBoolean("IS_PREMIUM", state);
  editor.apply();
  premiumState = state;
}

 زمان query گرفتن این error رو میده

04-21 04:58:40.971 3877-3921/emad.rahim.app.tendays E/IABUtil/Security: Base64 decoding failed.
04-21 04:58:40.971 3877-3921/emad.rahim.app.tendays E/AndroidRuntime: FATAL EXCEPTION: Thread-174
java.lang.IllegalArgumentException: com.example.android.trivialdrivesample.util.Base64DecoderException: encoded value has invalid trailing byte
at com.example.android.trivialdrivesample.util.Security.generatePublicKey(Security.java:84)
at com.example.android.trivialdrivesample.util.Security.verifyPurchase(Security.java:60)
at com.example.android.trivialdrivesample.util.IabHelper.queryPurchases(IabHelper.java:933)
at com.example.android.trivialdrivesample.util.IabHelper.queryInventory(IabHelper.java:607)
at com.example.android.trivialdrivesample.util.IabHelper.queryInventory(IabHelper.java:585)
at com.example.android.trivialdrivesample.util.IabHelper$2.run(IabHelper.java:680)
at java.lang.Thread.run(Thread.java:856)
Caused by: com.example.android.trivialdrivesample.util.Base64DecoderException: encoded value has invalid trailing byte
at com.example.android.trivialdrivesample.util.Base64.decode(Base64.java:532)
at com.example.android.trivialdrivesample.util.Base64.decode(Base64.java:473)
at com.example.android.trivialdrivesample.util.Base64.decode(Base64.java:419)
at com.example.android.trivialdrivesample.util.Security.generatePublicKey(Security.java:72)
at com.example.android.trivialdrivesample.util.Security.verifyPurchase(Security.java:60) 
at com.example.android.trivialdrivesample.util.IabHelper.queryPurchases(IabHelper.java:933) 
at com.example.android.trivialdrivesample.util.IabHelper.queryInventory(IabHelper.java:607) 
at com.example.android.trivialdrivesample.util.IabHelper.queryInventory(IabHelper.java:585) 
at com.example.android.trivialdrivesample.util.IabHelper$2.run(IabHelper.java:680) 
at java.lang.Thread.run(Thread.java:856)