Malicious user can get infinite free trial by repeatedly refund and repurchase right before the freeTrial ends

Handle WatchPug Vulnerability details The current design/implementation allows users who are refunded before to get another freeTrial. This can be exploited by malicious users to get an infinite free trial. PoC Given: keyPrice is 1 ETH; freeTrialLength is 31 days. A malicious user can: 1. Call...