title: PayPal sdk doesn't go in sandbox mode and App id is not changing
body: <p>I have some problems with PayPal sdk on iOS.I created my app at <a href="https://developer.paypal.com/webapps/developer/applications/myapps" rel="nofollow">https://developer.paypal.com/webapps/developer/applications/myapps</a> and got client id . i used paypal sample apps with my ID its working fine in mock and sandbox mode. when i am using this in my apps each time my apps moving in mock data mode i am getting response from paypal server. And id is always API-PAYMENT-ID-1843</p>
  
  <pre><code>client =     {
      environment = mock;
      "paypal_sdk_version" = "2.10.2";
      platform = iOS;
      "product_name" = "PayPal iOS SDK";
  };
  response =     {
      "create_time" = "2015-05-26T09:51:13Z";
      id = "API-PAYMENT-ID-1843";
      intent = sale;
      state = approved;
  };
  "response_type" = payment;
  </code></pre>
  
  <p>My code as follows</p>
  
  <pre><code>PayPalPayment *payment = [[PayPalPayment alloc] init];
  payment.amount = [NSDecimalNumber decimalNumberWithString:numberStr];
  payment.currencyCode = @"USD";
  payment.shortDescription = [NSString stringWithFormat:@"Buy %@ Invites",[self.invitesDict objectForKey:@"invites_count"]];
  if (!payment.processable) {
      // This particular payment will always be processable. If, for
      // example, the amount was negative or the shortDescription was
      // empty, this payment wouldn't be processable, and you'd want
      // to handle that here.
  }
  _payPalConfig = [[PayPalConfiguration alloc] init];
  _payPalConfig.acceptCreditCards = YES;
  
  PayPalPaymentViewController *paymentViewController = [[PayPalPaymentViewController alloc] initWithPayment:payment
                                                                                              configuration:self.payPalConfig
                                                                                                   delegate:self];
  [self presentViewController:paymentViewController animated:YES completion:nil];
  </code></pre>
  
  <p>Is there any solution for this</p>