[Google Maps API v2] How to get signature using places API

http://code.google.com/intl/ko/apis/maps/documentation/webservices/index.html#GeneratingSignatures

I followed upper link sample.
but i don't know what is 'center' parameter?
I don't get any descriptions about 'center' parameter.

and i don't understand how to get signature in google api manuals.

is there anyone who explain how to get signature simply?

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