Affiliate marketing is a pay-for-results channel. Someone recommends your product, and when a customer buys through their link, you pay them a commission. If nobody buys, you owe nobody.
That sounds simple, and at the level of a single sale it is. The complications sit around the edges: who gets credit, when a sale becomes money, and who pays for the software that connects the two sides. This guide explains the whole loop in plain English, then points you to the Slice docs for the mechanics.
The three parties
Every affiliate program has three participants.
- The advertiser owns the product and pays for results. Slice calls these businesses; in the wider industry they are merchants or brands.
- The publisher does the promoting. They might be a YouTuber, a newsletter writer, a review site, a comparison site, or someone with a large social following.
- The platform records clicks, attributes sales, applies the rules, and in many setups handles payment. Slice is one of these platforms.
Some programs cut the platform out and track everything by hand. That works for a handful of partners and falls apart as soon as you need reliable attribution, consistent payouts, and a record of what was agreed.
Follow one sale
Here is the loop from a click to a commission.
- The publisher shares a tracked link, for example a product review on their site.
- A reader clicks it. The platform records the click and forwards the reader to your product with an identifier attached.
- The reader buys within the campaign's cookie window.
- Your checkout or payment provider tells the platform about the sale, including that identifier.
- The platform credits the publisher with a commission.
- The sale sits pending during the validation period. After that, it can be approved and funded.
Each step matters. A broken link, an expired cookie, or a checkout that never passes the identifier back all produce the same result: the publisher sends a real customer and earns nothing. Good platforms make each step visible so both sides can see what happened.
Commission is not the platform fee
This is the distinction founders most often miss.
The commission is what the publisher earns. It is set by the advertiser, as a percentage of the sale or a fixed amount. On a €100 sale with a 20% commission, the publisher earns €20.
The platform fee is what the affiliate software charges. Some platforms take a percentage of the sale, some charge a monthly subscription, and some do both.
Slice separates these cleanly. Publishers keep 100% of the advertised commission. Advertisers pay the commission plus a 20% Slice fee on top. On that same €100 sale, the publisher still earns €20; the advertiser pays €24 in total, including €4 to Slice.
That structure is deliberate. A publisher should be able to compare two programs by their advertised rates without working out which platform shaved money off. An advertiser should be able to see the real cost of a sale in one number.
Why validation exists
Most affiliate programs do not pay a commission the moment a sale is recorded. They wait.
The wait is called the validation period. It covers the window in which a customer can return the product, cancel a subscription, or dispute a charge, plus a few days to process the outcome. On Slice the validation period is the product's returns period plus seven days, capped at 67 days.
During that period a commission is pending, not owed. The advertiser can still decline a sale with a reason, for example because it was fraudulent, duplicated, or never shipped. After validation, an approved commission still needs funding before it becomes available to pay out.
Publishers should treat pending commissions as estimates, not money in the bank. Advertisers should fund approved commissions promptly, because a program that tracks plenty of sales but never pays becomes a reputation problem fast. The fee and payout docs cover the full lifecycle.
What each side actually needs
A publisher deciding whether to promote a product wants to know:
- What does it pay, exactly?
- How long is the cookie window?
- When can the advertiser decline a sale, and for what reasons?
- How predictable is the brand at paying?
- Are there creative assets and a landing page ready to use?
An advertiser setting up a program wants:
- A clear commission that still leaves margin.
- Reliable tracking that survives real checkouts.
- A way to review and decline invalid sales.
- Visibility into which partners actually drive revenue.
- Cost predictability, especially at the start.
When a platform makes both lists short and visible, partnerships start faster. When either side has to guess, the partnership usually does not start at all.
When affiliate marketing beats ads
Advertising asks you to pay before you know the outcome. You buy impressions, clicks, or placements, then wait to see whether they turn into revenue. Affiliate marketing reverses that order: the cost arrives only after a sale is confirmed.
That makes it attractive when:
- Your product has a clear price and a repeatable sale. Software subscriptions, courses, physical products, and services with a defined scope all fit.
- You can afford the commission on each sale. A commission that eats the entire margin is not a channel; it is a discount you cannot switch off.
- Someone already has your audience's attention. A reviewer, educator, or community operator can move a reader from curiosity to purchase faster than a cold ad.
- You want to grow without a large upfront budget. This is the main reason startups and solo builders start here.
It is weaker when the product is vague, the price is trivial, or the buying decision takes months and many people. In those cases the commission may not justify the work a publisher has to do.
Where to go next
If you are deciding whether the channel fits your company, read affiliate marketing for startups. If you are building alone and need distribution without an ad budget, read affiliate marketing for indie hackers.
If you want the mechanics before the strategy, the tracking docs explain how a click becomes a credited sale, and how affiliate commissions work walks through every state from tracked to paid.
The short version: affiliate marketing is not free traffic. It is traffic you pay for only after it works. For a product with healthy margins and an audience that trusts someone else's recommendation, that trade is often a better first channel than an ad account.
Written by the Slice team
We build the free affiliate marketplace where advertisers pay only for validated sales and publishers keep 100% of the commission. These guides come from the same design decisions behind the product.