你如何获得一个Foursquare用户的联系信息，他们通过4sq的API检查你的地点?

I am currently writing an application as the owner of a particular venue. I want to be able to programmatically reach out to a user who checks in to the location via the contact information associated with their Foursquare account (if they've chosen to make that information public). I am currently writing an application as the ow