Typically 3rd-party application developers will have their own API Key which lets their app talk to Constant Contact, however some developers may require you to provide them with your own API Key and Access Token. If you are using an integration that wants an API Key and Access Token, but are just not sure where to find those, then this step-by-step guide is for you.
To generate an API Key, you will first need to create or log in to a developer account at https://constantcontact.mashery.com/ This will be separate from your normal Constant Contact account.
You should see your API Key pre-filled in the App/Key field. (If you don't, click the Sign In link at the top right of the page and log in to the Mashery developer account you created earlier. Once you are logged in, the page will refresh and you will see your app and API Key listed there.)
Click the gray Get Access Token button
On the window that appears, click the blue I already have an account link
Log in to your Constant Contact account (not your developer account) and click Allow
You will then be provided with your Access Token, which you can now use along with your API Key in your integration!
So that you can easily use them where you need to, we recommend you save this information somewhere, such as a Word or text document, however you can always log in to your developer account to see your API Key, and follow the steps above to view your Access Token again.
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