### **[Authentication](https://docs.foursquare.com/developer/reference/v2-authentication)**

Authenticating against the API is done by passing your API Key.

### **[Versioning](https://docs.foursquare.com/developer/reference/v2-versioning)**

Adapt to Foursquare API changes on your own schedule.

### **[Rate Limits](https://docs.foursquare.com/developer/reference/v2-rate-limits)**

Usage of the Places API is subject to rate limits.

### **[Errors](https://docs.foursquare.com/developer/reference/v2-errors)**

HTTP status codes to indicate success or failure of an API request.

### **[Localization](https://docs.foursquare.com/developer/reference/v2-localization)**

Specify the locale by setting the Accept-Language HTTP header in your request.