Unity In-apps Integration Guide
Window->Package Manager and install In App Purchasing package

Add Products to the Google play and Appstore account with the same product ID you have in your game template settings
Troubleshooting In-apps:
Test in-apps: 1. Start the game in Unity and purchase something, if everything ok means Unity IAP work fine and nothing wrong in code.
Test in-apps on device:
2. To test in-apps use internal test release for Google Play and Testflight with Sandbox user for the Appstore.
If the purchasing don’t work on the device, don’t panic, try to get logs from the device and contact us.
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