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How to generate an API Key and Access Token


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 This will be separate from your normal Constant Contact account.


Once you have created an account and verified the email address (or logged in to your existing developer account), you are ready to register a new app and get an API Key here:


  1. Fill out the Application Name field. This should be the name of the application or integration you are connecting your Constant Contact account to.
    Application Name
  2. Ignore all of the other fields and scroll to the bottom of the page.
  3. Check the box indicating you agree to the terms of service (we’re sure you read it all) and click Register Application.

You will then be presented with your API Key information.

API Key Information


Now that you have your API Key, you are ready to generate an Access Token. The easiest way to do so is to use our API Tester located here:


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.)


  1. Click the gray Get Access Token button
    Get Access Token

  2. On the window that appears, click the blue I already have an account link
    I already have an account

  3. 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!

Access Token


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.

Was this guide helpful? What other types of information would you like to see guides on? We're happy to help get you the information that you need! Let us know in the comments!


Hello, my name is David and I'm a member of our API Support team. I assist developers and customers with integrating with Constant Contact's API.

Hi Bridgette, Since the sign-up form is for your client you will want to generate the Access Token for her account. To do that you will want to log in with her account. This is Step 3 in the Access Token section of the this article above. Also to note Constant Contact has developed our own WordPress plugin for sign-up forms if that would be a helpful alternative.
Occasional Participant

More curiosity than anything. Is there a way for my customer to revoke a token that was issued to my API? Say they wish to disable the API.

Hi JamesH3676, The Access Token is attached to the Constant Contact account and it has an expiration date built in which you can modify in your code when your integration requests an Access Token to be generated. However; if your customer wants to have an Access Token manually removed they will need to call in to our support department and one of our agents will be able to revoke the token for them. We are currently developing our v3 API and will be looking to potentially include a customer facing method for this, but at this time we have no ETA for the v3 release and it will not launch with this feature either.