lib_unity_purchase/Documentation~/UnityIAPAmazonExtendedFunctionality.md

Extensions

Extended functionality

Amazon User ID

To fetch the current Amazon User ID for other Amazon services, use the IAmazonExtensions:

public void OnInitialized
    (IStoreController controller, IExtensionProvider extensions)
{
    string amazonUserId =
        extensions.GetExtension<IAmazonExtensions>().amazonUserId;
    // ...
}