App-Specific Shared Secret
The App-Specific Shared Secret is a unique authentication key that allows RevenueCat to securely communicate with Apple's servers on your behalf. This secret is mandatory for receipt validation when using StoreKit 1.
In-App Purchase Key
When configuring a new App Store app in your RevenueCat project, you will need to add an in-app purchase key. This is a required configuration step. When using Purchases v5.x+ (i.e., StoreKit 2), transactions will fail to be recorded without this key being set. This can result in users not accessing the purchases they are entitled to.
App Store Connect API Key
You may upload an App Store Connect API key for RevenueCat to import products and prices from App Store Connect.