In-app purchases ask for real money in Internal Testing (React Native + Google Play Console)

Question

Question: I’m testing in-app purchases in React Native using the react-native-iap library. I’ve set everything up for internal testing in the Google Play Console, but my app still asks for real money instead of simulating Sandbox purchases.

What I’ve Done: Internal Testing Setup:

App is published to the Internal Testing Track. I install the app via the test link, and the Play Store shows I’m an internal tester. In-App Products:

Products are active and correctly retrieved with getSubscriptions() (including offerToken for Android). Test Accounts:

Added test accounts under Settings > License Testing. Verified that I’m logged into the Play Store with the test account. Implementation:

Purchases work with real payments and are processed correctly. Problem: Why am I still being asked for real money during tests, and how can I activate the Sandbox mode to simulate purchases?