For years, digital marketers were told to prepare for the cookie apocalypse. Chrome would pull the plug on third-party cookies, the old attribution machinery would grind to a halt and everyone would wake up in a brave new (cookieless) world.
Then the apocalypse never quite came.
In fact, in April 2025, Google confirmed that Chrome would retain its existing approach to third-party-cookie choice rather than introducing the standalone prompt it had previously discussed. Later that year, Google also announced that several Privacy Sandbox advertising technologies – including its Attribution Reporting API, Topics and Protected Audience – would be retired.
So – case closed? Affiliates can forget all that tedious cookieless-tracking stuff? Right?
…Not quite.
Safari already blocks third-party cookies by default, while Firefox’s Total Cookie Protection isolates cross-site cookies so they cannot simply follow users around the web. Safari also places limits on some first-party storage when it detects tracking behaviour.
The cookie may not be fully dead and buried, but trusting a browser cookie to carry your attribution strategy on its back is nonetheless looking increasingly brave.
Was the ‘cookieless future’ oversold?
The shift was never really about reaching a magical date after which cookies ceased to exist. It was more about browser-dependent tracking becoming less dependable.
For a gambling affiliate, this is an important distinction to bear in mind; you need to know whether the visitor you sent to an operator subsequently registered, deposited and generated value.
If the connection between click and conversion depends entirely on information stored in somebody’s browser, privacy settings, browser rules, ad blockers and other technical restrictions can all create gaps. And those gaps aren’t merely annoying analytics problems; they potentially affect revenue.
This is precisely why affiliates should think less about becoming “cookieless” and more about becoming less browser-dependent generally.
Server-side to the rescue?
The central technology here sounds considerably more intimidating than it actually is: server-to-server, or S2S, tracking.
The basic journey is fairly simple.
A player clicks an affiliate link. The tracking system generates a unique identifier – usually a click or transaction ID – and passes it to the operator. The operator stores that identifier. If the player later completes a tracked action, such as registration or first deposit, the operator’s server sends the identifier and conversion information back to the affiliate tracking platform through a postback.
In other words, instead of asking the user’s browser to remember everything, the two systems talk to each other.
Performance-marketing platform Tune describes server postback tracking in essentially those terms and recommends transaction-ID-based postbacks over browser-based pixel tracking where they are available.
Perhaps the industry’s mistake was treating cookieless tracking as a deadline
For affiliates, the takeaway is straightforward: ask for S2S tracking wherever your operator partners support it.
This should be accompanied by disciplined use of parameters. A unique click ID tells you which click generated the conversion; sub-IDs can tell you which site, page, campaign, placement or traffic source produced it.
This is hardly glamorous stuff. I doubt anyone has ever opened an affiliate conference keynote by dramatically unveiling a well-structured sub-ID. But, while not particularly sexy, clean parameters can be the difference between knowing that an operator generated 100 FTDs and knowing why it generated them.
Can you trust your operator’s tracking?
This shift also changes the operator-affiliate relationship.
Historically, tracking could feel like somewhat clunky infrastructure: somebody else set it up and the affiliate checked the dashboard. But that mindset is increasingly risky.
Affiliates should know whether partners support postbacks, which conversion events can be returned, how click identifiers are stored, how duplicate events are handled and how quickly conversions appear.
Then test it.
Send test clicks through different pages and campaigns. Confirm that IDs arrive intact. Check that registrations and deposits map back correctly. Compare the affiliate tracker with operator reporting and your own analytics.
And expect discrepancies…
S2S is more robust, not magical. If a click ID is lost before the operator stores it, the postback cannot resurrect it. Nor does server-side tracking automatically solve every cross-device journey. A player who clicks on a phone and later registers on a completely separate device may still require an operator-side authenticated or otherwise lawful matching mechanism.
The clever bit isn’t installing S2S and declaring victory; It’s knowing where attribution can still break.
First-party is better – but it isn’t invisible
Affiliates should also strengthen measurement on their own properties.
Server-side tagging, for example, allows data to pass through an endpoint controlled by the website before being distributed to analytics or advertising providers. Google itself highlights the additional control this provides over what data is shared, along with opportunities to validate and normalise events.
This makes first-party infrastructure attractive; it doesn’t make it a privacy-law cheat code – a distinction that’s particularly important in a regulated industry.
The UK Information Commissioner’s Office updated its guidance in April 2026 specifically to cover cookies, pixels, device fingerprinting and similar tracking technologies. European regulators have likewise made clear that replacing a third-party cookie with another identifier does not automatically remove consent or data-protection obligations.
Fingerprinting is therefore a particularly questionable “solution” to cookie restrictions. If the strategy for respecting privacy controls is secretly identifying the device another way, you haven’t really solved the privacy problem – you’ve just put it in a shady trench coat.
First-party data should mean greater control and cleaner governance, not more inventive surveillance.
What affiliates should actually do now
The priority isn’t to launch a giant overnight technology migration.
Start with an audit of the journey from affiliate click to operator conversion. Find where cookies, pixels and browser storage still sit in that chain, then identify which partners support transaction-ID-based postbacks.
Standardise click IDs and sub-IDs so traffic can be compared properly, and test integrations rather than assuming they work.
The cookie may not be fully dead and buried, but trusting a browser cookie to carry your attribution strategy on its back is nonetheless looking increasingly brave
On your own sites, assess whether server-side measurement or first-party infrastructure could improve data quality and control – while making sure consent and data collection still comply with the markets you operate in.
Then reconcile the numbers. Your analytics platform, affiliate tracker and operator dashboard will rarely match perfectly; what matters is understanding why.
Tracking should also become part of commercial due diligence. CPA and RevShare matter, but so does an operator’s ability to tell you reliably which players are yours.
Cookies survived. Complacency shouldn’t
Perhaps the industry’s mistake was treating cookieless tracking as a deadline.
There is no single switch being flipped. Chrome, Safari and Firefox take different approaches, browser policies will keep evolving, and regulators are looking at tracking technologies far beyond cookies.
So waiting for certainty is pointless.
The better strategy is to rely less on fragile browser behaviour, use server-side signals where appropriate, take greater control of first-party data and build privacy into the tracking architecture from the start rather than paperwork added afterwards.
The future of affiliate tracking may still contain cookies, but it probably shouldn’t depend on them.