it is possible to test in-app-purchases for development testing without a developer account? I can´t access sanbox and Features without being a developer member in itunes connect.
No it's most definitely not possible. You will require a registered developer account.
It's NOT possible.
Here is the documentation: https://developer.apple.com/in-app-purchase/
Well It's Possible now,
From the source https://medium.com/globant/wwdc-2020-announcement-view-from-a-developers-eye-c94770e85b09#:~:text=StoreKit%20Testing%20in%20Xcode%2D12
Major highlights are:
A local environment for testing your in-app purchases without needing to connect to App Store servers.
Set up a test environment, create a StoreKit configuration file, and prepare to validate receipts locally.
Test a variety of in-app purchase scenarios and automate those tests (like success purchase, failed purchase, interrupted purchase, external transactions, and Subscription offers) with the StoreKitTest framework. Improvements for testing in the sandbox environment.
You can test it in all the simulators of iOS 14, tvOS 14, watch OS 7, mac OS Big Sur as well as on the physical devices.
Create unit & UI tests with XCTest You have full control of the StoreKit in the Xcode environment without user interaction.
You can trigger the renewal of the subscription for testing the scenarios offline.
For more details please check: Apple documentation https://developer.apple.com/documentation/xcode/setting-up-storekit-testing-in-xcode https://developer.apple.com/documentation/storekittest https://developer.apple.com/videos/play/wwdc2020/10659/
PS: New Testing StoreKit in a macOS app requires Xcode 12 or later running on macOS 11 or later.
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