🐛 Fix
PLEN-11292: For multi-step family subscriptions, the start date of the automatically created multiuser access was incorrectly set to the start of the last step of the subscription. Multiuser access now starts with the first step of the subscription, and already affected records have been corrected accordingly.
PLEN-11288: When Apple In-App Purchase data from different StoreKit versions was mixed, this could lead to incorrect purchase dates or failed validation. The system now detects these inputs reliably and returns clear error messages, ensuring only matching and verifiable purchase data is processed.