old_contents: // var foursquare = (require('foursquarevenues'))('CLIENTIDKEY', 'CLIENTSECRETKEY');
  var foursquare = (require('foursquarevenues'))('Y5D1QX0FS4R5ZTJ5TLU3RDL1U0PUE4ZU3NPTQDS2AGMW1KGP', 'XM2PZ15QKM0I5TQYTCTYXOVBGWKRHCCFZFNNKZYQA1JV1SNZ');
  
  var params = {
      "ll": "40.7,-74"
  };
  
  foursquare.getVenues(params, function(error, venues) {
      if (!error) {
  	console.log(venues.toString());
      }
  });
  
  foursquare.exploreVenues(params, function(error, venues) {
      if (!error) {
    	console.log(venues.toString());
      }
  });
  
new_contents: const dotenv = require('dotenv');
  
  dotenv.config();
  
  var foursquare = (require('foursquarevenues'))(process.env.FOURSQUARE_CLIENT_ID, process.env.FOURSQUARE_CLIENT_SECRET);
  
  var params = {
      "ll": "40.7,-74"
  };
  
  foursquare.getVenues(params, function(error, venues) {
      if (!error) {
  	console.log(venues);
      }
  });
  
  foursquare.exploreVenues(params, function(error, venues) {
      if (!error) {
    	console.log(venues);
      }
  });
  
subject: Use dotenv for Foursquare credentials.