How do I make Amazon IAP work with Unity's own IAP Framework?

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Tessellation asked · Oct 23, 2018 at 06:50 PM

How do I make Amazon IAP work with Unity's own IAP Framework?

Without installing the Unity Amazon IAP v2 package, I can get Amazon IAP to work, but it isn't properly notifying my app about a purchase or existing purchases when the app is uninstalled and reinstalled.

So then I installed Amazon's IapV2 package and now it won't compile because both these packages install Amazon JAR libraries to do purchasing. I can't uninstall Unity's IAP system because I use this for my Google Play APK.

Is Unity's AmazonAppStore implementation supposed to work or should we be using AmazonIapV2 only? I might write a custom amazon IStore extention for Unity's IAP system, unless one already exists?

iap unity

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Answer 1 · 2018-10-25T14:21:44Z

Levon@Amazon answered · Oct 25, 2018 at 02:21 PM

Hi Tesselllation,

Thanks for posting! You will need the Amazon's IAP v2 Unity plugin installed, and you'd need to enable IAP service support in your Unity editor. If you ended up with 2 JARs, please delete one of them. What kind of error are you getting? Could you please either post a screenshot, or copy and paste the exact error(s) from the logs, so we could investigate? Thanks!

Amazon In-App Purchasing Unity plugin: https://developer.amazon.com/sdk-download

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Tessellation · Oct 25, 2018 at 04:46 PM

I have Amazon's IAP v2 Unity Plugin installed. When I set the Billing Mode in Unity's own IAP software (which I can't uninstall) to AmazonAppStore, I get the following errors when I try to build the APK, which indicate that an Android plugin (JAR or AAR or something) has been linked multiple times:

java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/package-info;
java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/PurchasingListener;
java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/PurchasingService;
java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/ResponseReceiver;
java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/internal/a;
java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/internal/a/a;
java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/internal/a/b;
java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/internal/a/c;
java.lang.IllegalArgumentException: already added: Lcom/amazon/device/iap/internal/a/c$1;

You can see that Unity's IAP software includes support for Amazon App Store, however, this implementation has problems, such as not returning from a purchase when there are errors and not reporting existing purchases when you uninstall and reinstall the app. So I installed AmazonIAPv2 plugin, which works, but doesn't seem to play nice with Unity's IAP system. Apparently, Unity's IAP system automatically selects the active billing/store plugin JAR/AAR at build time, based upon the BillingMode that you select in the Editor, but I don't know where those plugins are located. I can see it in the Temp/StagingArea as follows:

You can see that this will conflict with in-app-purchasing-2.0.76.jar, which is installed by AmazonIapV2 plugin here (also in Temp/StagingArea):

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Tessellation · Nov 07, 2018 at 09:51 PM

Hi, @Levon@Amazon, could you please follow up to my answer?

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How do I make Amazon IAP work with Unity's own IAP Framework?

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