title: Restrict a Service Within a Specific Area
body: <p>Following is my scenario</p>
  
  <p>1:  First i want to define a service offered in 3 particular areas. I want to save those areas in mongodb.(i don't know whether 1 area would be saved as one lat long value or an array of lat long )</p>
  
  <p>2: i want to offer the service only to those users who exist in those areas where service has been offered.</p>
  
  <p>Any suggestions for implementing this scenario and what google APIs would help me in this case? </p>