When confirmation links (formerly known as double opt-in links) were introduced to the campaign builder, the functionality was heavily restricted to prevent abuse of the new confirmation system. Primarily, the ability to control what the link text actually says, and what contacts see upon confirming, were both uneditable. This hack uses a legacy merge field to insert custom confirmation links into a campaign builder e-mail.
Infusionsoft Cookbook – Chapter 10.1 – Creating A Custom Confirmation Link Inside Campaign Builder
