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Constant Contact is a tool for businesses to manage their email newsletter and customer marketing. Their suite of products not only includes email marketing, but also event registration, surveys and promotions. The Help Scout app instantly connects your customer to their Constant Contact profile. You can see the lists they are subscribed to and have one-click access to the Contact Management screen in Constant Contact. Here's a snapshot of what it looks like in Help Scout:
Activation instructions
Register your application (Help Scout) with Constant Contact. Fill out the form will the following values:
- Application Name: Help Scout
- Company Name: Help Scout
- Redirect URI for OAuth calls: http://www.helpscout.net
Register Application 
Key Get Access Token
After clicking the Get Access Token button, you'll be redirected to a Constant Contact login/registration page. You can either sign in to your existing account, or if you don't have an account, you can create one from that page. After you're logged in, click on the Generate Access Token link. 
On the next page, you'll be prompted to grant access to Help Scout. Click the Allow button! You'll be redirected once more to a page containing your new access token. Copy your token and head over to Help Scout.
From Help Scout, install the Constant Contact app to wrap up. Paste your API key (referenced in the first step) and your access token in to the corresponding fields. Select which mailboxes you'd like to connect, then hit the Save button. 