Integrating Unity IAP with Google Play

These are my notes from integrating Google Play in-app purchases with Unity in April 2023.

Upload a build with billing permission#

Add this permission to AndroidManifest.xml:

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<uses-permission android:name="com.android.vending.BILLING" />

After uploading the APK and getting it approved, create the in-app products or subscriptions in Google Play Console.

Install Unity IAP#

Open Window → Package Manager → Unity Registry, select In App Purchasing, and install it.

Check Unity Player settings#

Go to Edit → Project Settings → Player:

Under Other Settings, use IL2CPP as the scripting backend for this setup.
In the configuration section, set API Compatibility Level to .NET Standard 2.0 or later.
Make sure the package name matches the registered app.
Enable Build App Bundle (Google Play).

Add the Google license key#

Find the key on the monetization settings page in Google Play Console. Enter it in the project’s In-app purchase (IAP) settings on the Unity Dashboard.

In my setup, the corresponding Unity editor panel could report an error. I configured the key through the Dashboard instead.

Add license-test accounts#

In Google Play Console, open License testing → License testers from the home page.

License testers and internal-testing participants are different lists. Configure the relevant accounts in each. In the original test setup, China-region accounts could not complete payments; account region was one of the things I needed to check.

Test the store build#

Publish an internal-testing build and download it from Google Play. Testing that installed store build was necessary for this workflow.