An API Key is a value passed in by applications calling our API (application programming interface) to identify the integration making the call. An API Key is required to use the Constant Contact API.
If you're using an integration that's requiring you to enter your own API Key, please ask the company or developer that build the integration to use their own API Key for all of their users, to avoid this unnecessary work. If you'd like to create your own key so that you can use that integration immediately, feel free to use the steps below, keeping in mind that it's meant for developers. You can enter your company's information as much as possible (e.g. "Application Name" can be your company name), and enter "N/A" for anything you're unsure of.
Creating new V2 API keys is no longer supported. Please use the V3 Developer Portal and the V3 API to create new API keys instead.
There are two types of API Keys:
|API Key Type||Description||Rate Limits|
|Standard API access||Provides access to public Constant Contact API endpoints||
4 calls per second
10,000 calls per day
|Partner API access||Provides access to all public endpoints plus all Partner-only endpoints. Partner API Keys are only available to Constant Contact Partners, and are approved on a case-by-case basis. Learn more about partnering with Constant Contact.||
20 calls per second
250,000 calls per day
First, if you are building an application that will access only one Constant Contact account, you do not need to worry yourself about them! Fahgettaboudit!
If you are building an application that will be used by many Constant Contact accounts owners, you will be using a redirect uri along with your API key and client secret in the OAuth 2.0 authentication flow. When you registered your application and got an API key, a default redirect_uri of http://localhost was assigned to the app. You can modify the redirect_uri in API Keys > Applications when you're logged into your Mashery account.
Once you are signed up and logged into Mashery, you will be able to:
Allow about 5 minutes for changes you make to API Keys in Mashery to be active in Constant Contact.
You will receive email notification for the following rate limit conditions: