Set up a connection to ActiveCampaign

API Guide Link: https://developers.activecampaign.com/v3/reference#overview

Link to authentication page: https://developers.activecampaign.com/v3/reference#authentication

1. Name: Required: Name the connection.
2. Application: Required: The form will automatically select ActiveCampaign.
3. Subdomain: Required: Log in to your account. The subdomain displays in your browser URl field. For example, in https://celigo71443.activehosted.com/admin/ the subdomain is celigo71443.
4. API key: Required: Enter your API key. If you do not have have an API key, use the following steps to get an API key.
   1. Log in to your account.
   2. Click Settings > Developer.
   3. The Key field contains the required API key.

5. Borrow concurrency from (optional): Select another connection from the list....

6. Concurrency level (optional): Up to 25 allowed....