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We want to be able to associate app users with real transactions done.The problem is that we have the user’s email address on application back end side, and we track user purchase amounts, but when we go into the Google Wallet transactions we have no way of knowing which transaction/s belong to that user. We need a solution for this, because even if we have the user's email, we cannot search transactions by email address.

Is it possible to update the receipt numbers we are sending in the API to include the Google Wallet Receipt number instead of the time stamp ?

Please, provide us your suggestions.

I.S.S
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2 Answers2

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I thought the answer would lie in the postback facility. That gives google's user ID and order number. However, I didn't see how to convert either of those to an email address for sending the digital good just purchased.

BTW. I rejected doing the fulfilment client side as that seemed insecure. If I'm wrong about that then why would they offer the postback facility?

... then I realised, we could do part of it client and part server side.

I guessed that something comes back from the client-side success callback.

   success: function(result) {
      console.log('success',result.response.orderId);
      complete(result.response.orderId);
    },

So, I now have the google's orderId on the client side and there I know the user's ID. So my complete() function can send the orderId and our userId to the server which can then match this with successful payment orderId from the postback (which happens first) and fulfil the order.

Yes, this is inelegant, but I believe it to be a secure solution.

Maybe slightly more elegant is to use the [sellerData] property in the submission payload to contain our user ID and order ref. We then have more items to match after the success callback has happened. I think I'll hold off delivering the digital good until all those checks have been completed.

What I do not understand is why cannot this kind of suggestion (or a better one) be found in the wallet tutorial?

Paul

user1712240
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  • I have somehow find the solution, we could get orderId, as orderId is a field of INAPP_PURCHASE_DATA json (orderId - A unique order identifier for the transaction. This corresponds to the Google Wallet Order ID.) http://developer.android.com/google/play/billing/billing_reference.html getting orderId we can associate with appropriate user email on client side and send such data to the server, getting orderId we can search for in Google Wallet – I.S.S Sep 16 '13 at 14:55
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My answer here refers to the previous answer provided:

  1. Totally agree on "why cannot this kind of suggestion (or a better one) be found in the wallet tutorial?".

  2. Your suggested solution does not seem to be very secured (to say the least). You want the client to send you their username/email/client-id in the Success callback... This means that anyone will be able to send you their ID, even if they did not make a purchase. They can add a random order-ID and hope to get a match (and then repeat the process many times in order to increase the chances).

  3. My guess is that the username/email/client-id lies somewhere in the request object sent from Google to the postback URL (your server's doPost routine). But I have the feeling that you need to add something in the JWT generated in your Purchase function before it is passed to the google.payments.inapp.buy routine.

  4. Looking for an answer myself...

  5. Here is a possible solution, although I have not yet tested it myself:

Download the 'zip' file from: https://code.google.com/p/wallet-online-quickstart-java/downloads/list

Take the entire 'com' folder and add it to your project source folder (sorry, I have not been able to find a JAR for this package). Then, add the following code to your servlet:

...

import com.google.wallet.online.jwt.JwtResponseContainer;

import com.google.wallet.online.jwt.util.JwtGenerator;

import com.google.wallet.online.jwt.JwtResponse;

...

public void doPost(HttpServletRequest request, HttpServletResponse response) ...

{

    try

    {

        String maskedWalletJwt = request.getParameter("maskedWalletJwt");

        JwtResponseContainer jwtResponseContainer = JwtGenerator.jwtToJava(JwtResponseContainer.class, maskedWalletJwt, SellerSecret);

        JwtResponse jwtResponse = jwtResponseContainer.getResponse();

        String email = jwtResponse.getEmail();

        ...

    }

}

One thing I'm not so sure about, is request.getParameter("maskedWalletJwt").

You might have to add this parameter when calling the google.payments.inapp.buy routine.

barak manos
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