The following video shows you how to pull data from Infusionsoft's referring affiate record. What this means is that if Johnny was the person who sent you to a site, you could see any of Johnny's custom fields using this shortcode.
Here is an example of a shortcode with 2 sets of the square brackets "[" and the "]" stripped out.
i4w_m_referral_custom id='i4w_db_Referral_ContactId' field=''
i4w_m_referral_custom id='i4w_db_Referral_ContactId' field='_MyCustomField'
The id is grabbing the ContactId of the referring affiliate and then the field decides which field from that referring affiliate's contact record should be pulled into the page.
field: the name of the date field in Infusionsoft you'd like to grab ie: _AffiliateWebsite3 or _AffiliateWebsite4