I offered to settle an account with a merchant for half the money he thinks I owed. I explained my reasons and he agreed to settle the account in full. I have two questions: how can I be sure he did not leave any derogatory comments on my credit file before I make my payment ? Also, can he leave bad remarks on my credit file after he accepts to settle the account and I send my payment ? Can and should I ask for guarantees before I send any money ? Thanks.