This is most likely within the Billing script you are using. The Bank that is used by the Terminal (You indicated it is a Canon iMFP in this case) has a Billing Event that has a Script. In this Script you can look for the text you would like to change then change it. Once you have made this change, you will need to click Change Control in the Pharos Administrator for the change to become effective.
Let me know if that helps.
That helped! I knew it was there...just a little buried.
Glad you found what you were looking for!