What is the version of Campaign that you use ? And can you elaborate a bit on your usecase to make sure we understand the need here?
I have similar requirement.
I would like to know if API is available for following
a) Preview email Template built with-in AC by an 3rd party application via API call?
b) Select email template from 3rd party application , and publish it to AC , so AC could send email on selected template.
Little urgent on need for details, can you please revert.