A plain-language explanation
Referral in web analytics means a visit by a user who came to the website through a link placed on another website.
Where it helps in practice
Referral traffic comes through links on other sites, while analytics may misattribute a payment gateway or owned subdomain.
The decision before implementation
Define unwanted referrals, cross-domain rules and campaigns before comparing partners.
How to verify the result
Review source pages, parameters, visit quality, conversion and session breaks around payment.
