Link IDs
Link IDs can be added to any of your order page links. A link ID can be used to track specific URLs for any purpose, such as advertising tracking. The way a Link ID works is by adding parameter ID "linkid=****" to the end of the order page link. For example: Link ID可添加到您的所有直接订购页面链接中（见Relationships），应用于各种用途的具体URL追踪，例如广告追踪。Link ID的使用是通过在直接订购页面链接末端添加"&linkid=****"来实现。例如：
https://www.regnow.com/checkout/cart/add/xxxx-xlinkid=****
Whatever is used in place of the **** will be assigned to the link ID field. This will then be reported in your Business Intelligence --> ePen reports under the column "Program ID".
Information on how parameters are used can be found here.