What is the difference between first‑click and last‑click attribution?

First‑click gives full commission credit to the first affiliate link clicked; last‑click gives full credit to the last link clicked before purchase.

What is a chargeback in affiliate marketing?

A chargeback happens when a customer disputes a transaction and the merchant refunds the money, causing the affiliate's commission to be reversed.

Affiliate Marketing Glossary 2026: 80 Essential Terms (EPC, CPA, AOV, LTV)

Affiliate marketing has its own language — and mastering it is the first step to success. Whether you're analysing an income report, setting up tracking, or negotiating with networks, knowing terms like EPC, CPA, AOV, and LTV gives you an edge. This 2026 glossary covers 80 essential terms, from beginner basics to advanced concepts like cookieless attribution and incremental revenue lift. Each entry includes a plain‑English definition and a real‑world example. Bookmark this page — you'll come back often.

Essential Reading for Affiliate Beginners

Affiliate Marketing Income Report 2026: What 200 Real Affiliates Actually Earned Last Year A data-driven income report based on 200 verified affiliate marketers in 2026. Breaks down median monthly earn…
How Long Does It Take to Make Money With Affiliate Marketing in 2026? Realistic Timeline by Method A data-backed timeline showing how long it realistically takes to earn first commission, reach $1K/month, and …
Affiliate Marketing Business Models 2026: Content Sites vs Paid Traffic vs Email vs Social — Which Earns Most? A comparison of the four primary affiliate marketing business models in 2026. Covers SEO content sites, paid t…
Affiliate Marketing Mistakes That Cost Beginners 12 Months: What Not to Do in 2026 An honest breakdown of the most expensive affiliate marketing mistakes in 2026. Covers promoting wrong product…

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Terms Defined

Core Categories

2026

Latest Updates

100%

Practical Examples

Glossary Sections

Performance & Revenue Metrics (EPC, CPA, AOV, LTV...)
Financial & Commission Terms (Commission, Cookie Window, Payout...)
Tracking & Attribution Terms (Click, Impression, Attribution Model...)
Network & Platform Terms (Affiliate Network, Sub‑affiliate, OPM...)
Legal & Compliance Terms (FTC Disclosure, GDPR, Cookie Consent...)
Advanced & Industry Terms (Parasitic SEO, Incremental Lift, Cookieless...)
Frequently Asked Questions

Performance & Revenue Metrics

These key performance indicators (KPIs) help you measure the effectiveness of your affiliate campaigns. Understanding them is crucial for optimising earnings.

EPC (Earnings Per Click)

Definition: The average commission earned for each click on an affiliate link. Calculated as total commission divided by total clicks, often shown per 100 clicks (EPC = commission/clicks).

Example: You earned $500 from 1,000 clicks → EPC = $0.50. If a network shows "$50 EPC", it usually means per 100 clicks ($50/100 clicks = $0.50 per click).

CPA (Cost Per Action)

Definition: A commission model where you're paid when a referred user completes a specific action (sale, lead, sign-up). Also refers to the advertiser's cost per acquisition.

Example: A credit card affiliate programme pays $150 CPA for each approved application — you earn $150 only when the user is approved, not just for a click.

CPL (Cost Per Lead)

Definition: A sub‑type of CPA where you're paid for generating a lead (e.g., email sign-up, form submission, quote request). Usually lower payout than CPS but easier to convert.

Example: A solar panel installer pays $40 CPL for every homeowner who submits a zip code and contact info.

CPS (Cost Per Sale)

Definition: The most common affiliate model — you earn a commission only when a referred user makes a purchase. Also called "revenue share".

Example: Amazon Associates pays 1–10% CPS depending on product category. A $100 blender at 5% commission earns you $5 per sale.

AOV (Average Order Value)

Definition: The average dollar amount spent per transaction from your referred customers. Higher AOV = higher commission per sale.

Example: You sent 50 customers to a store; total sales = $5,000 → AOV = $100. If you earn 10% commission, you made $500 from those 50 sales.

LTV (Lifetime Value)

Definition: The total revenue a customer generates over their entire relationship with a merchant. Important for subscription and SaaS affiliate programmes with recurring commissions.

Example: You refer a customer to a $50/month software with 30% recurring commission. If they stay 12 months, LTV = $180 (12 × $15 commission).

ROI (Return on Investment)

Definition: (Revenue – Cost) / Cost. Measures the profitability of your affiliate campaigns, especially for paid traffic.

Example: You spend $500 on Google Ads and earn $1,500 in commissions → ROI = (1500-500)/500 = 200%.

ROAS (Return on Ad Spend)

Definition: Revenue generated per dollar spent on advertising. ROAS = Revenue / Ad Spend.

Example: Spending $100 on Facebook ads yields $400 in commission → ROAS = 4.0, or 400%.

CR (Conversion Rate)

Definition: The percentage of clicks (or visitors) that complete the desired action (sale, lead). CR = (Conversions / Clicks) × 100.

Example: 200 clicks on your affiliate link, 10 sales → CR = 5%. Industry average for well‑optimised content is 2–5%.

CTR (Click-Through Rate)

Definition: The percentage of people who see your affiliate link (or ad) and click it. CTR = (Clicks / Impressions) × 100.

Example: Your email broadcast is opened by 1,000 subscribers; 50 click your affiliate link → CTR = 5%.

Pro Tip: Track EPC and AOV Together

A high EPC can come from either high conversion rates or high AOV. If your EPC drops, check whether your audience is buying cheaper products (lower AOV) or simply not converting (lower CR). Use both metrics to diagnose issues.

Financial & Commission Terms

Understand how money flows from merchant to affiliate — including payment models, cookie windows, and thresholds.

Cookie Window (Cookie Duration)

Definition: The length of time (usually days) after a user clicks your affiliate link that you can still earn a commission if they purchase. Typically 30–90 days, some programmes offer 120 days or even lifetime.

Example: A hosting programme has a 60‑day cookie. A visitor clicks your link today but buys on day 55 — you still get credit. If they buy on day 61, you don't.

Recurring Commission

Definition: A commission model where you earn a percentage of the customer's subscription payment every month (or billing cycle) for as long as they remain a customer.

Example: Kajabi pays 30% recurring commission. Refer a customer paying $149/month → you earn $44.70 every month they stay. Over two years, that's over $1,000 from one referral.

High-Ticket Commission

Definition: Commissions of $500 or more per sale, typically from enterprise software, luxury goods, or high‑end coaching programmes.

Example: A B2B software programme pays $2,000 per closed sale. With just 5 sales a month, you earn $10,000.

Two‑Tier (Sub‑Affiliate) Commission

Definition: You earn commissions not only on your own referrals but also a percentage of what affiliates you recruit earn. Usually 5–10% of their commissions.

Example: You recruit 10 sub‑affiliates who each earn $1,000/month. A 5% two‑tier commission gives you an extra $500/month passively.

Payment Threshold (Minimum Payout)

Definition: The minimum amount you must earn before the network or merchant will issue a payment. Usually $50–$100, but some are as high as $500.

Example: A network has a $50 threshold. You earn $45 this month — you won't get paid until next month when your total reaches at least $50.

Net‑X Payment Terms

Definition: Payment schedules where "Net‑30" means you're paid 30 days after the end of the month in which the sale occurred. Net‑60, Net‑90 are common for some networks.

Example: A sale on March 15 under Net‑30 terms is paid around April 30. For Net‑60, payment would be around May 30.

Chargeback

Definition: When a customer disputes a transaction and the merchant reverses the sale. The affiliate's commission is also reversed (clawed back).

Example: You earned $150 CPA for a software sale. Three months later, the customer cancels and requests a refund — your $150 is deducted from future earnings.

Commission Reversal (Clawback)

Definition: Any removal of previously credited commissions, often due to returns, cancellations, or fraud.

Example: A hosting affiliate pays monthly recurring commissions. If the customer cancels in month 2, you stop earning for that customer and any unpaid future commissions are reversed.

Tracking & Attribution Terms

How affiliate networks and merchants track clicks, sales, and assign credit across multiple touchpoints.

Affiliate Link (Tracking Link)

Definition: A unique URL containing your affiliate ID or tracking code. When a user clicks it, the network records the click and sets a cookie (or uses other tracking methods).

Example: https://example.com/?ref=123 — the ref=123 identifies you as the affiliate.

Link Cloaking

Definition: Using a plugin or tool to hide the raw affiliate link behind a cleaner, branded URL (e.g., yoursite.com/go/product). Helps with trust and link management.

Example: Instead of https://amazon.com/?tag=yourid-20, you cloak it to yoursite.com/recommends/blender.

First‑Click Attribution

Definition: An attribution model where the first affiliate link a user clicks gets full credit for the sale, even if they later click other affiliates before buying.

Example: User clicks your link on Monday, then clicks another affiliate's link on Wednesday, and buys on Friday. First‑click gives you all the credit.

Last‑Click Attribution

Definition: The most common model — the last affiliate link clicked before the purchase receives full commission credit.

Example: Using the same scenario, last‑click would give credit to the other affiliate whose link was clicked on Wednesday.

Multi‑Touch Attribution (MTA)

Definition: A more advanced model that distributes commission credit across multiple touchpoints (e.g., 40% to first click, 20% to middle clicks, 40% to last click). Rare in standard affiliate networks but used in enterprise programmes.

Example: A customer clicks your review, then a coupon site, then returns via a social post before buying. MTA would split the commission among all three.

Server‑to‑Server (S2S) Tracking

Definition: A cookieless tracking method where conversion data is sent directly from the merchant's server to the affiliate network's server via API or postback URL. More reliable than cookies.

Example: After a sale, the merchant's system automatically pings your affiliate network with the conversion details, bypassing the user's browser.

Postback URL (Pixel Fire)

Definition: A URL provided by the affiliate network that the merchant calls (fires) when a conversion occurs, passing transaction data. Used in S2S tracking.

Example: Network gives you https://network.com/postback?clickid={clickid}&amount={sale_amount}. The merchant replaces the placeholders and calls it after each sale.

ClickID (SubID)

Definition: A unique identifier appended to an affiliate link that allows you to track which campaign, source, or keyword generated the click. Essential for paid traffic optimisation.

Example: https://offer.com/?aff=123&subid=facebook_campaign1 — the subid tells you the conversion came from Facebook Campaign 1.

Deeplink

Definition: An affiliate link that sends the user directly to a specific product or category page, rather than the merchant's homepage.

Example: Instead of linking to Amazon.com, you deeplink to amazon.com/dp/B08N5WRWNW (the exact product you're reviewing).

Network & Platform Terms

Key players and structures in the affiliate marketing ecosystem.

Affiliate Network

Definition: An intermediary that connects merchants (advertisers) with affiliates (publishers). Handles tracking, reporting, and payments. Examples: ShareASale, Impact, Awin, CJ Affiliate.

Example: You join ShareASale, apply to individual merchant programmes inside the network, and get a single login to manage all your affiliate links and payments.

Merchant (Advertiser, Vendor)

Definition: The company that sells products or services and pays commissions to affiliates for referrals.

Example: Nike, Semrush, Bluehost — they all have affiliate programmes where you earn by promoting their products.

Affiliate (Publisher)

Definition: The person or company that promotes merchant offers and earns commissions. That's you.

Example: A blogger, YouTuber, or social media influencer who posts affiliate links.

OPM (Outsourced Programme Management)

Definition: Agencies that manage affiliate programmes on behalf of merchants. They recruit affiliates, handle compliance, and optimise performance.

Example: Acceleration Partners or PartnerCentric run affiliate programmes for large brands like Adidas or Reebok.

Sub‑Affiliate (Second Tier)

Definition: An affiliate you recruit under a two‑tier programme. You earn a small percentage of their commissions.

Example: You create a course on affiliate marketing and promote it via an affiliate programme. Other affiliates promote your course — they are your sub‑affiliates.

Affiliate Dashboard

Definition: The reporting interface provided by a network or merchant where you see clicks, conversions, commissions, and payment history.

Example: Impact.com's dashboard shows real‑time clicks, EPC, approved commissions, and pending payments.

Legal & Compliance Terms

Stay on the right side of the law and platform policies.

FTC Disclosure

Definition: A clear, conspicuous statement that you earn commissions from product recommendations, as required by the US Federal Trade Commission. Must be placed before any affiliate links.

Example: "This post contains affiliate links. If you purchase through these links, I may earn a commission at no extra cost to you."

GDPR (General Data Protection Regulation)

Definition: EU privacy law that affects affiliate tracking if you have visitors from Europe. Requires cookie consent and transparency about tracking.

Example: You must display a cookie consent banner that allows users to opt out of tracking cookies before setting affiliate cookies.

CCPA (California Consumer Privacy Act)

Definition: California's privacy law giving consumers the right to opt out of the "sale" of their personal information — includes some interpretations of affiliate tracking.

Example: Your site may need a "Do Not Sell My Personal Information" link if you use targeted affiliate cookies for California residents.

Cookie Consent

Definition: A user permission mechanism (usually a banner) that asks visitors to accept or reject non‑essential cookies, including affiliate tracking cookies.

Example: Your GDPR‑compliant banner has an "Accept All" and "Reject All" button. If rejected, your affiliate network should not set its tracking cookie.

Brand Bidding (Trademark Bidding)

Definition: Bidding on a merchant's trademarked brand name in paid search ads to drive affiliate traffic. Many programmes prohibit this in their terms.

Example: Bidding on "Nike shoes" as a keyword in Google Ads and sending traffic to your Nike affiliate link — Nike's programme likely forbids this.

Incentivised Traffic

Definition: Traffic generated by offering rewards, cashback, contests, or points to users for clicking affiliate links. Many networks prohibit incentivised clicks.

Example: A cashback site that gives users 5% back if they shop via the site's links — that's incentivised, and many merchants forbid it unless explicitly allowed.

Advanced & Industry Terms

For experienced affiliates and those dealing with 2026's evolving landscape.

Cookieless Tracking

Definition: Tracking affiliate conversions without relying on third‑party cookies, using methods like S2S postbacks, first‑party cookies, or probabilistic modelling. Critical in 2026 as browsers phase out third‑party cookies.

Example: An affiliate network uses a first‑party cookie set on the merchant's own domain plus a postback from the merchant's server to attribute sales.

Incremental Lift (Incrementality)

Definition: The additional sales generated by an affiliate that would not have happened without that affiliate's promotion. Used by sophisticated merchants to value affiliate channels.

Example: A coupon site's sales might be non‑incremental (users would have bought anyway). A niche review site often generates high incremental lift.

Parasitic SEO

Definition: Unethical tactics where affiliates manipulate search engines by using subdomains or content syndication on high‑authority sites to rank for competitive keywords. Against Google's guidelines.

Example: Creating a free blog on WordPress.com with a subdomain like "bestlaptops.wordpress.com" and filling it with thin affiliate content — can be penalised.

Bridge Page (Pre‑sell Page)

Definition: A landing page that sits between your traffic source and the merchant's offer. It adds value, builds trust, and often captures emails before redirecting to the affiliate link.

Example: You run Facebook ads to a bridge page that reviews three email marketing tools, captures an email address, then sends the user to your ConvertKit affiliate link.

Click Spam (Cookie Stuffing)

Definition: A fraudulent technique where an affiliate forces their cookie onto a user's browser without a genuine click, often through pop‑unders, forced redirects, or malware. Banned by all networks.

Example: A user visits a torrent site, and in the background, the site silently sets 50 affiliate cookies without the user clicking anything — this is cookie stuffing.

E‑E‑A‑T (Experience, Expertise, Authoritativeness, Trustworthiness)

Definition: Google's quality framework for evaluating content. Affiliate sites must demonstrate first‑hand experience and genuine expertise to rank well in 2026.

Example: A product review includes original photos of the writer using the product, detailed pros/cons, and an author bio with relevant credentials.

Parity (Rate Parity)

Definition: An agreement that an affiliate must offer the same or better rates/prices as the merchant's direct channel. Common in travel and hotel affiliate programmes.

Example: Booking.com requires that your displayed rates are not higher than what users see on Booking.com directly — you can't add a markup.

Attribution Window

Definition: Same as cookie window — the period after a click during which you can earn commission. Also used in cross‑device attribution.

Example: A 30‑day attribution window means if a user clicks your link on desktop but buys on mobile within 30 days, you still get credit.

Bounty (Lead Bounty)

Definition: A fixed‑fee CPA for a non‑sale action, like a free trial sign‑up or account creation.

Example: Amazon Associates pays $3 bounty for each new Prime Video trial user referred, even if they don't buy anything.

Cross‑Device Tracking

Definition: The ability to track a user across multiple devices (e.g., clicking on phone, buying on laptop) and still credit the affiliate.

Example: A user clicks your affiliate link on their iPhone, but later buys the product from their work computer. Cross‑device tracking ensures you still earn the commission.

Key Takeaway for 2026

Third‑party cookies are disappearing. If you haven't yet, start using affiliate networks that support S2S tracking, first‑party cookies, or other cookieless tracking methods. Also, E‑E‑A‑T is now a ranking prerequisite for affiliate content — thin reviews no longer work.

Frequently Asked Questions About Affiliate Marketing Terms

EPC (Earnings Per Click) measures your average commission per click, while CPA (Cost Per Action) is a commission model where you're paid per specific action. A programme might have a $50 CPA, and your EPC for that programme could be $0.25 if 200 clicks generate one $50 sale.

Most standard programmes use 30–90 days. High‑ticket and SaaS programmes often have 90–120 days. Amazon Associates has a 24‑hour cookie for most purchases (except for certain bounty events). Longer is better for expensive or considered purchases.

Net‑30 means you'll be paid 30 days after the end of the month in which the sale occurred. Example: Sales in January → paid around the end of February. Net‑60 is 60 days after month‑end, etc.

First‑click gives full commission credit to the first affiliate link clicked in a customer's journey. Last‑click gives full credit to the last link clicked before purchase. Most networks use last‑click, which favours affiliates closer to the decision (e.g., coupon sites).

A chargeback happens when a customer disputes a transaction with their credit card issuer and the merchant refunds the money. The affiliate's commission is then reversed (clawed back) because the sale was effectively undone.