Well, looks like a disabled PayPal fingerprint authentication system is the least of the woes being faced by owners of the Verizon variant of the Galaxy S5. Verizon customers of Samsung's latest and greatest are reporting that after a few days of working properly, the camera fails to start with a “Warning: Camera Failed” message. Unfortunately, a reboot does not help in this case – in fact, nothing helps, as even a factory reset fails to correct the issue, leaving replacements as the only option for affected consumers.
The issue is likely at the hardware level, and while many have taken to the XDA community to voice their concern, there doesn't seem to be any official word on a fix at the moment. That should change in the next few days as the issue escalates, but in the meantime, don't shy away from asking for a replacement from Verizon or the retailer you bought your Galaxy S5 from.