How do I add a callback URL?

From the Navigation toolbar, choose Settings.
Select APIs under Developer Space.
Scroll down to the Callback URL section.
You can use Merge tags to find out which contact performed an unsubscribe action. The type of merge tags that can be used are shown in the screenshot below.
Click Configure now to configure an Unsubscribe callback URL.
Enter a callback URL, (ex: "http://example.zylker.com/") where you can view information about your contacts' actions in lists.
Choose a Request Type.
Click Save.

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