As a matter of practice, everything has been delegated in the Extradition Act. All the minister's discretion has been delegated to officials, with the exception of the decision to order surrender. That is done to insulate the minister for that very important decision he has to make at the end of the process and to ensure that he doesn't prejudge the outcome of that important decision.
For that reason, the minister is not involved in the issuance of the authority to proceed and has never been involved in the issuance of authority to proceed.