These libraries wrap around all of Constant Contact's V1 API functionality, giving you easy to use classes which will save you time and effort in developing your integration.
ColdFusion Wrapper Library - Compatible with ColdFusion 9, ColdFusion 8 Beta available
PHP Wrapper Library - Compatible with PHP 5+
C#.NET Library - Compatible with .NET 2.0+
PHP OAuth2 Example - Use this if you are having trouble authenticating using OAuth2 (or just want a simple example of how to do it).
Contacts Collection and Resource