To manage your card, go to https://caltech-sp.transactcampus.com/ and click on the "Sign In" button. Sign in using the same username and password that you use to log in to access.caltech.edu.
Once you're signed in, you'll be able to:
view account balances
browse your card transactions
download your account statements
deactivate your card if it has been lost or stolen, and later reactivate it if appropriate
manage your alert preferences
When finished, be sure to click "Sign Out" in the upper-right corner of the application. Note that to completely sign out, you must close your browser.