This is such an important feature! ... View more

Hello,   In order to avoid that message, you would need to migrate your integration to the v3 API, as the v2 API does not have the ability to create email campaigns in the new Custom Code Editor.  ... View more

Thank you for confirming that moving to the v3 API is a way forward.   Unfortunately, you've put us in the position of having to do a significant amount of work to stay with Constant Contact. ... View more