Each of your Prices to Beat has a unique ID that you can use when referring to your trip. Some companies require employees to include their Rocketrip IDs when submitting expenses.
If you are using the Rocketrip Extension within Concur, you will be given your Rocketrip ID once you book your travel arrangements.
You can find your ID by clicking "My Trips" and going to your specific trip. Your ID will be labelled "Trip ID:".