Why does Google Wallet ask for the last four digits of your SSN? Do I have to use it?

Google wallet requires the last four digits of your SSN to work.Why does google need this information, can i trust them with it.and is there another w

Google wallet requires the last four digits of your SSN to work.
Why does google need this information, can i trust them with it.
and is there another way for me to use google wallet without giving them this information.

or:Google wallet requires the last four digits of your SSN to work.Why does google need this information, can i trust them with it.and is there another way for me to use google wallet without giving them this information.

or:google is using it for verification purposes to make sure you are who you say you are and yes you can trust google

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