Hello everyone,

I’m a developer working on a React Native app that uses RevenueCat for managing in-app purchases. For over three months, we’ve been encountering a persistent issue specifically in the iOS Sandbox environment:

Error 8: The receipt is not valid
The receipt is not valid. The purchased product was missing in the receipt. This is typically due to a bug in StoreKit.

Resolving this issue in the Sandbox environment is our top priority right now, as it’s critical for us to conduct proper testing before moving forward. We’ve tried several solutions, including:

Regenerating new API keys according to RevenueCat’s guidelines, though we were unable to successfully create a .cer file. We're not sure if the issue with creating the .cer file is related to the error we're encountering.
Creating a new Sandbox user with a different Apple ID.
Following all the relevant documentation available online and provided by RevenueCat.
Despite our efforts, the issue remains unresolved, which is significantly delaying our project. We are eager to get this issue resolved so we can proceed with testing and ensure a smooth launch.

If anyone has encountered a similar issue or has insights into how we might address this, we would greatly appreciate your advice.

Thank you in advance for your assistance.