Im trying to get the API key and access token, but the register page for the api key is not working https://constantcontact.mashery.com/apps/register. I've tried opening this on chrome and firefox, no luck. Any fix??
I was able to just register a new application and get a new API Key. What error message are you getting when you visit that page? Can you provide a screenshot?
View API documentation, code samples, get your API key.