Description : In RockPaperScissors.sol, the line winningToken.transferFrom(msg.sender, address(this), 1); is used to move a token from the player to the contract. However, it doesn’t check if the transfer was successful. This is risky because if the transfer fails and the code doesn’t notice, the rest of the contract might keep running as if everything is fine, which can lead to bugs or unexpected behavior.

Impact : If the transfer fails and the contract doesn't catch it, a player might enter the game without actually paying or the contract may behave as if it received the token when it didn't.

Tools Used : Slither , Vs code

Recommendations : It is recommended to use OpenZeppelin's SafeERC20 library