Ok For anyone new to this using Python or another backend scripting language or (POSTMAN)....... Make a v3 application in your account. Get the client_id(API key) and secret from this app. Find a way to base 64 the client_id:secret <<in this format together. You'll need it.. Paste https://api.cc.email/v3/idfed?client_id={{APIKEY}}&redirect_uri=https://localhost&response_type=code&scope=campaign_data Into a brroowser and allow the application the {{APIKEY}} is your client_id.... you will get a url like https://localhost/?code=kasdlfakjsdlakjdfaljf09sdf0asdfu0adsfj You will need the above code.... In postman set up a call to https://idfed.constantcontact.com/as/token.oauth2?code={{CODE}}t&redirect_uri=https://localhost&grant_type=authorization_code Wherre the {{CODE}} is your code from step 4 In this call you need to setup an Authorization header with the BASE64 encoded stuff from step 3. Get a JSON block back with auth and refresh key and use in your backend app....
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