I am here currently with a similar issue.... this is the only thread that came up when I did a Google search.  I am simply trying to implement the "Subscribe Form" in WordPress (I use Beaver Builder if it matters), which allows me to select who my list is with, so I chose Constant Contact.  It then asked me for the API key and Access Token. So... I managed to get my API key on developer.constantcontact.com but I don't have an "Access Token".  I also have a "Client Secret", which is apparently not the same thing, since it doesn't work.  So... How do I find my Access Token?  The link you gave above to community.constantcontact......* sends me to https://constantcontact.mashery.com/io-docs once I have an API Token, and says to type it into there and click "Get Access Token" --- but when I do that, it tells me my API key is invalid!  Huh?  I'm confused ... View more