Hello,   The new CTCT SDK for API v.3 template is available now here: https://github.com/mikeks/constantcontact-v3   Currently the SDK can be used to create (POST), update (PUT) and schedule custom code emails. It also has a method to renew Access Token. The library is used for in-home email automation scenario. I made the SDK public available. Please feel free to use it as the initial template. Please feel free to collaborate to add more features to the library.   Best regards, Mike Keskinov ... View more