New PHP Library for V3 API is now available!
Seeing that Constant Contact is no longer supporting specific language API wrappers, and also seeing that there are no good V3 API wrappers on packagist.org, I decided to write one.
Please check it out at https://packagist.org/packages/phpfui/constantcontact You can also view the complete source code and documentation at http://phpfui.com/?n=PHPFUI%5CConstantContact.
It is a full implementation of the Constant Contact V3 API and updated nightly with any changes that are made to the YAML file.
If you run into any issues, please submit an issue or pull request at https://github.com/phpfui/ConstantContact
Hope this helps everyone.
It would also be possible to support other languages if someone wants to do a port to C#, Python, Ruby, etc. Basically you would just need to rewrite the code generator to output another language and then implement a new Client and Base class.