A cashback portal pays a share of a commission it receives from the retailer. The payment depends entirely on a tracking chain that has several places to break.
The click creates the record
Clicking through from a portal sends the shopper to the retailer by way of an affiliate network, which stamps the visit with an identifier before forwarding the browser.
That identifier is stored as a cookie in the browser. If a purchase follows within the cookie's lifetime, the network attributes the sale to the portal that referred it.
Nothing about the shopper's account is transmitted to the store. The portal learns a purchase happened only because the network reports a matching transaction identifier back to it.
Attribution rules decide who is credited
Most affiliate programs credit the last referring link before checkout. A later click on a different coupon site overwrites the earlier cookie and takes the commission with it.
This is why portals warn against opening other deal pages after the click. The advice is not about loyalty; it is about which cookie survives to checkout.
Retailers set the attribution window, and it varies widely. A long window makes tracking forgiving, while a short one means an abandoned cart revisited days later earns nothing.
Browser behavior breaks the chain
Privacy features that limit third-party cookies, ad blockers and strict tracking settings can all prevent the identifier from being stored or read at checkout.
Switching devices between the click and the purchase usually breaks tracking as well, since the cookie lives in one browser on one machine.
Completing checkout inside a retailer's app rather than the browser is another common failure, because the app session does not carry the browser's cookie.
Payment waits on the return window
Reported earnings stay pending until the retailer confirms the sale is final. Confirmation usually waits until the return period has closed.
The retailer pays the network, the network pays the portal, and the portal pays the member, and each of those steps runs on its own settlement cycle.
That chain is why balances sit pending for weeks or months even when nothing has gone wrong, and why a returned item removes the reward retroactively.
Missing trip claims are investigated by the network
When a purchase does not appear, the portal files an inquiry with the affiliate network, which asks the retailer to search its records for the transaction.
Approval depends on the retailer finding evidence the sale was referred. Without a stored identifier there is often nothing to find, and the claim is denied.
Keeping the order number and the date of the click gives that inquiry something concrete to work with, which is the only real influence a shopper has over the outcome.