Abstract: A method in a transaction system for authorizing a commercial transaction is disclosed. The method includes receiving transaction-related information that includes an identifier of an account. The identifier is used to access information associated with the account in the transaction system. Verification steps are performed on the information and an approval signal is generated upon satisfactory verifications. The method further includes initiating connection with a communication device associated with the account. The transaction system requests a transaction confirmation from the communication device over the connection. The transaction system authorizes the commercial transaction on receiving the approval signal and the transaction confirmation. A transaction system that performs the above method and a communication device that is able to respond to the request for a transaction confirmation are also disclosed.