Thanks Tim/John, that breaks it down well. I think that should be pretty 
easy to add alongside the AppEngine verification endpoint I created for my 
in-app payments.

William

On Tuesday, December 4, 2012 11:56:28 PM UTC+10, John Coryat wrote:
>
> William,
>
> Tim pretty much has it broken down except we have an unlock code table 
> that has a "uses" field that decreases each time it's used. When that gets 
> to zero, the code is disabled. That's how we can give away batches.
>
> I don't know if there's a market for this but it is very handy for beta 
> testers, reviewers and for anyone or group you want to offer premium access 
> without going though the Google Play in-app purchase process.
>
> -John Coryat
>
>
> On Tuesday, December 4, 2012 12:03:09 AM UTC-6, William Ferguson wrote:
>>
>> Without providing info that compromises the security of your setup, I 
>> think there would be many here interested in hearing more about your 
>> solution John. Could you elaborate?
>>
>> William
>>
>> On Tuesday, December 4, 2012 2:56:29 PM UTC+10, John Coryat wrote:
>>>
>>> We use In-App-Billing for premium access and built in an "unlock code" 
>>> system. It works great. No trouble, no cost and we can give out batches. 
>>> Recently, I gave out a batch of 100 to a first responder who loved the app 
>>> and told me that he gets other first responders to download it. Now he can 
>>> give them premium versions for free. 
>>>
>>> Cost: $0.00 
>>>
>>> -John Coryat
>>>
>>>
>>> On Monday, December 3, 2012 6:23:14 PM UTC-6, Nathan wrote:
>>>>
>>>> I just wanted to mention my experience. 
>>>>
>>>> I have wanted a way to do something that should be very simple - give 
>>>> my app to someone free. 
>>>>
>>>> There is still no good, completely free way to do that. 
>>>>
>>>> However, I looked up the Google Play Gift Cards. 
>>>> One of the options was to choose email delivery. 
>>>>
>>>> I bought a batch of five $10 cards at walmart.com and chose 'Email 
>>>> Delivery'.
>>>> In 20 minutes, I got an email with five gift codes. 
>>>>
>>>> I gave one of the codes to a person who asked for a free license, for a 
>>>> valid reason. I included the instructions. 
>>>>
>>>> Some things to note:
>>>> It helps if your app is exactly $10 (or $25, or $50). 
>>>> You are still out $3 in that case if they buy your app. 
>>>> You are out all $10 if they don't buy your app. Not a big concern for 
>>>> me. They just better not crawl back asking for another $10 code. 
>>>>
>>>> In case you ask, yes, I know it can be free to hand out an APK. I won't 
>>>> do it for these reasons. 
>>>> I don't like passing APKs in the open. My APK is readily available on 
>>>> several sites, I know. 
>>>> LVL probably won't work. 
>>>> Updates won't work. 
>>>> I don't know if in app purchases will work. 
>>>> After every single update, I will get an email from each and every 
>>>> person to whom I have ever sent the APK, nagging me to send them the 
>>>> latest 
>>>> update. 
>>>> All the good feelings I had about giving them the free product for 
>>>> their charitable nonprofit cause will then melt away and I will begin to 
>>>> think of them as greedy and annoying.  
>>>>
>>>> Nathan
>>>>
>>>>

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