Code libraries / SDKs in over 30 different programming languages to help you quickly get started with using the OpenCage Geocoding API| opencagedata.com
Full documentation and reference for the OpenCage Geocoding API for forward and reverse geocoding: formats, parameters, response codes, best practices, etc.| opencagedata.com
How to guide to turn GPS coordinates (longitude/latitude) or addresses into ISO 3166-1 and ISO 3166-2 codes| opencagedata.com