Due to strict browser privacy settings, ITP, ETP, user tracking / cookies data can't be shared across domains. Therefore, when users navigate from Domain A to Domain B, Google Analytics, Facebook Pixels and other pixels, will initiate a new user session, with new first party data, cookies and tracking information.
In cases where you advertise landing page on Domain A, which promotes products on Domain B, you will want to attribute the conversions to ad clicks that triggered the initial visit on Domain A.
Since the user first party data (i.e. Google Cookie ID) is associated with Domain A, it can't be used on Domain B, and consequently the conversions can't be attributed to the initial ad click.
- landing-page-blog.com - A landing page or blog where you review / promote products sold on your Shopify store.
- my-store.com - a Shopify store where your visitors can purchase your products.
AnyTrack TAG has a linking function that allows the first domain to place the clientId in the URL parameters of the destination URL parameter of a link. This way, the destination domain can read the clientId from the URL parameter and use it for tracking purposes.