Multiple log files in symfony

I'd like to set up an additional log file in symfony, so that some messages (payment processing in my case) would go to a different file from the rest of symfony. Is it possible?

Here's my current log configuration from factories.yml:

all:
  logger:
    param:
      level: debug
      loggers:
        sf_file_debug:
          param:
            level: notice
            file: /var/log/symfony/%SF_ENVIRONMENT%/%SF_APP%.log