In short
Affiliate marketing is a performance-based sales model: you only pay partners (the affiliates or publishers) when they deliver measurable success, such as a sale, a lead or sometimes a qualified click. That is the decisive difference to classic display advertising, where you pay for the ad simply being shown, regardless of whether anything happens.
In the affiliate model, you do not carry the risk of wasted reach alone. No sale, no commission.
For online retailers this is attractive because the budget is directly linked to revenue. For affiliates it is attractive because they can earn money without their own product, without a warehouse and without customer service; they only bring reach and trust. The strength of the channel lies precisely in this division of labour: one party has the product, the other has the attention.
How affiliate marketing works technically
The basic principle is simple; the mechanics behind it less so. An affiliate promotes your product via a special link that carries a unique partner ID. When a user clicks on it, a cookie that stores this ID is set in the browser. If the user then buys in your shop, the tracking system reads the cookie and assigns the sale to the right affiliate. Only then does the commission become due.
The fiddly part lies in the details: in the cookie lifetime (how long after the click does a purchase still count as referred?), in the attribution model (which affiliate gets the commission if several were involved in the sale?) and in the cancellation rate (how many referred purchases are returned later?). Anyone who misunderstands affiliate marketing as "place a link, collect money" overlooks precisely these adjustment screws.
The four parties in the affiliate triangle
Although people speak of a triangle, in practice there are usually four parties involved:
- The advertiser (merchant): you, as retailer or manufacturer. You provide the product, the advertising material and the commission logic, and you pay out at the end.
- The affiliate (publisher): the operator of websites, blogs, YouTube channels, newsletters or social media profiles who promotes your products and directs traffic to your shop.
- The affiliate network: the platform that brings advertisers and affiliates together, provides the tracking, measures clicks and sales and handles the payout. In the German-speaking region these include AWIN, Tradedoubler and the Amazon Associates programme.
- The customer: the end user who clicks and buys. Ideally, they notice nothing of the whole mechanism.
Some retailers do without a network and run their own in-house programme. This saves the network fee but shifts tracking, fraud detection and payout to your own responsibility. For most SMEs, starting via an established network is the more pragmatic route.
Commission models: what you are actually paying for
Not every affiliate programme rewards the same success. Which model suits depends on your product, your margin and your funnel. The common billing types:
| Model | Abbreviation | You pay for | Suits |
|---|---|---|---|
| Pay per sale | PPS | a completed purchase (fixed or % of the basket) | classic online retail, clear margins |
| Pay per lead | PPL | a qualified action (newsletter, enquiry, account) | products that need explaining, B2B, services |
| Pay per click | PPC | every referred click to your shop | building reach, rarely used due to a high risk of fraud |
| Lifetime commission | — | all future purchases of a referred customer | subscription models, software, consumables |
In practice, pay per sale dominates because it keeps the risk most cleanly with the affiliate. Pay per click sounds temptingly simple but is a gateway for click fraud and is hardly used any more in reputable affiliate marketing. Pay per lead depends on a watertight definition of a lead: what exactly counts as a valid lead? Without this definition you pay for empty email addresses.
Setting the commission at a realistic level
There is no universally "right" commission level, but there is a rule of thumb: the commission must be lucrative enough for affiliates to promote your product over competitors, and affordable enough for you that a margin remains after commission, network fee and product costs. In physical retail, commissions are often between 3 and 15 per cent; for digital products with high margins they can be significantly higher. Anyone who pays too stingily ends up at the bottom of the affiliates' priority list and is simply not promoted.
A concrete practical example
Imagine a medium-sized Shopware shop for outdoor equipment. The retailer sets up a partner programme via AWIN and sets the commission at 8 per cent of the net basket value, with a cookie lifetime of 30 days. An outdoor blogger with 40,000 monthly readers writes a test report on a trekking backpack and links it with his affiliate link.
In the first month, 1,200 readers click on the link and 36 of them buy, a conversion rate of 3 per cent, which is realistic for well-placed affiliate traffic. The average basket is 180 euros net. This results in 6,480 euros of revenue, of which 8 per cent (518.40 euros) goes to the blogger as commission. The network keeps its fee from this. What remains for the retailer: 6,480 euros of revenue for which he did not risk any advertising budget in advance. Only success triggers the costs.
Now the honest part: six of the 36 buyers send the backpack back. These cancellations are deducted from the commission, and the amount paid out drops accordingly. That is exactly why the cancellation rate is a metric you should take just as seriously in affiliate reporting as the conversion rate.
Affiliate marketing in the Shopware context
Shopware does not come with a full affiliate system out of the box, but one can be added via plugins and connections to networks. In practice, you attach the tracking pixel or the server-to-server callback of the respective network to every order. What matters is the clean transfer of the basket value and the order number so that cancellations can be offset correctly later.
A stumbling block that regularly leads to disputes between retailer and affiliate in practice: the interplay with voucher affiliates and the last-cookie-wins logic. If a customer becomes aware of your product through a content affiliate but then quickly googles a voucher code shortly before buying and returns to the shop via a coupon portal link, the voucher portal often collects the commission, even though the actual persuasion took place elsewhere. Clean attribution management is therefore not a nice-to-have; it decides whether your budget ends up with the partners who create real value.
Do not underestimate the legal obligations
Affiliate links are advertising. Affiliates must label them as such; in Germany, competition law and the rules on separating advertising from editorial content apply here. As an advertiser, you have a vested interest in your partners labelling cleanly, because warning letters can come back to the advertised brand. A clear programme policy that excludes inadmissible advertising methods such as brand bidding on your own brand name or spam mailings is part of the mandatory programme.
Common mistakes and their limits
The most common beginner's mistake: thinking of affiliate marketing as "passive income without effort". A programme that nobody looks after runs wild. Affiliates need up-to-date advertising material, quick approvals, reliable payouts and a contact person. A neglected programme does not attract good publishers.
- Tracking gaps caused by ad blockers and cookie consent: since ITP, stricter browser defaults and GDPR consent banners, cookie-based assignments get lost. Server-side tracking mitigates this but does not solve it completely.
- Fraud: cookie stuffing, fake leads and traffic from botnets. A reputable network filters out much of this, but you should not trust blindly.
- The wrong choice of affiliates: reach alone achieves nothing if the audience does not match your product. A tech blog that suddenly promotes garden furniture converts poorly.
- Miscalculated margin: anyone who bases the commission on the gross basket rather than on the reality of the contribution margin can build a programme that brings in revenue but makes a loss.
And a fundamental limit: affiliate marketing scales demand that already exists. It does not replace a bad shop, an unattractive product or a poor conversion rate. If your product page does not convert, you are just sending the affiliate traffic into a hole more efficiently.
How to build an affiliate programme
Anyone starting from scratch should not begin with the commission level but with the question of whether the product is suitable for affiliates at all. Affiliate marketing works best for products with a clear target group, a decent margin and a product page that converts well. A niche product with a loyal fan community is often more rewarding than a mass-market item in a price war, where customers only click on the cheapest provider anyway.
The typical set-up takes place in several steps that you should not skip:
- Define goals and metrics: do you want revenue, reach or new customers? Define in advance how you measure success; otherwise you optimise into the blue.
- Calculate the commission model and level: work backwards from your contribution margin. What is left after product costs, shipping and returns that you can pay out as commission without going into the red?
- Provide advertising material: banners, product data feeds, text links, voucher codes. The easier you make it for affiliates, the more likely they are to promote you.
- Write programme policies: what is allowed and what is not? Brand bidding, cashback, couponing, email advertising: set the rules of the game in advance.
- Recruit and look after affiliates: advertise via the network, approach suitable publishers specifically and communicate regularly.
The last point is the one most often underestimated. An affiliate programme is a relationship, not a vending machine. Good publishers have options: they promote the retailer who pays quickly, offers fair commissions and can be reached when something goes wrong.
Affiliate marketing in the marketing mix
Affiliate marketing rarely stands alone. It reaches into other channels and partly overlaps with them. Influencer collaborations are, at their core, often affiliate deals with a more personal face. Content affiliates such as test portals and comparison sites overlap with your SEO because they want to rank for the same keywords as you. And voucher and cashback portals operate at the very bottom of the funnel, just before the purchase is completed.
These overlaps are not a problem as long as you manage them. They become a problem when different channels poach commissions from each other and you end up paying twice for the same customer. A well thought-out attribution logic across all channels is therefore the prerequisite for affiliate marketing bringing in additional revenue instead of just redistributing existing revenue.
Assessment: is the channel worth it?
For most online retailers, yes, provided the margin is right and the programme is looked after. Affiliate marketing is one of the few channels with an inherently good risk profile: you pay for success, not on spec. It complements SEO and paid search well because it opens up reach that you would hardly build yourself: the base of trust of established publishers.
Anyone who wants to dig deeper into industry figures, network standards and the legal framework will find a reputable point of contact at the German Association for the Digital Economy: BVDW. To get started with the mechanics, however, a clear head, a sensible commission model and the discipline to read the reporting not only for revenue but also for cancellations and attribution are enough.