Tried to manage transaction like an ATM.

I tried to use the type system to ensure correctness and bring with me all the transaction in the case where I have to check all the data to find a specific one.

I didn't set a transaction in dispute but in case I searched for the same transaction number with a dispute opened and not resolved or chargedback. If the account has a chargeback, is locked and I won't accept any new operation on it.

I tried to cover every corner case with unit test, I don't have any other case in particular

Chargeback and Resolve I assumed that are final states, so even if I have a Chargeback on Dispute will block the account and no other actions are allowed, if it is resolved is not allowed a charged back