[FR][iOS] Detect purchase environment: production or sandbox #31

[JeffGuKang]

Description

StoreKit2 includes transaction information that indicates which server is being targeted.
This allows us to determine whether the purchase is occurring in the production or sandbox environment.

Swift Example

let transaction = await Transaction.latest(for: productID)
let isSandbox = (transaction?.environment == .sandbox)

Refer

• https://developer.apple.com/documentation/storekit/transaction
• https://developer.apple.com/documentation/storekit/transaction/environment

Expected Behavior

We can read environment parameter from transaction object.

Screenshots

Environment:

• expo-iap: 2.2.7
• react-native: 0.74.5
• Platforms (iOS, Android, emulator, simulator, device):

[hyochan]

Looks like the environmentIos field is already supported in serializeTransaction for iOS 16.0+ (ExpoIapModule.swift#L74). Since transaction.environment is only available from iOS 16.0, it won't be included on iOS 15.x, as expected.

Let me know if you need more details!