If the App is integrated with OLO native (online ordering module is developed by Punchh) for online orders then the messages on the online order confirmation screen are hardcoded in the app by developers.
To change this message, App update would be required. Please reach out to the brand CSM for the new app update request.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)