- Log into your Campaign Monitor account
- Click on "Account Settings" in the top menu (4th item)
- Your API key will be visible once you click the "Show API Key" link.
- Log into your Campaign Monitor account
- Click on "Clients" in the top menu (1st item)
- Select your Client
- Navigate to the "List & Subscribers" tab
- Slelect your List
- Just under the name of your list click on the small (change name/type) link.
- Your API Subscriber List ID will be now visible
Add: "You will only see the "Show API Key" link if you have verified your account. This is done by clicking the verification link in the email we sent you after your Campaign Monitor account was created."