"l. (User agrees to) pay for any unauthorized purchases made with the Credit Card before you notify us that the Credit Card was lost, stolen or possibly used without your permission. Your liability for unauthorized purchases is the least of (1) $50.00, (2) the total of unauthorized purchases made before you notify us, and (3) the amount for which you are liable under applicable law. You may give us notice by telephone or in writing in accordance with the section of this Agreement called "Notices and Customer Service."
I couldn't understand why a user would agree to pay unauthorized charges before notifying the credit card company (rather, that they MUST pay before notifying the company).
Still an awfully worded clause, though. Assuming state law doesn't conflict, they'd be liable for the unauthorized purchase total or $50 since it's impossible to notify them of an unauthorized purchase before it happens (2). 
