QR codes for referral programmes

A referral QR code puts a customer's unique referral link into the physical world (on packaging inserts, receipts and packing slips), so recommending your shop is a scan rather than a copied link. Attribution requires a unique code per customer, generated in bulk with the referral ID in the URL.

What the code adds to a referral scheme

Referral programmes live or die on how easily an advocate can pass the link on. Digitally that is solved, share buttons exist. Physically it is not: the moment a customer shows a friend the actual product ("where did you get that?") happens in kitchens and offices, nowhere near a share button. A referral QR code puts the link into that moment: the friend scans the card the customer kept, or the customer shows the code from their account page, and the referral attributes itself.

The mechanical requirement is a unique URL per referring customer:

example.com/r/anna-7h2k

The parameter identifies the referrer; the landing page credits both sides. Without per-customer uniqueness there is no attribution and therefore no referral programme, just a discount code with extra steps.

Generating per-customer codes

Digital-first: render the customer's code dynamically in their account page and post-purchase emails: one image-API call per customer via the keyless API, no pre-printing.
Print runs: export customer referral URLs and generate codes in bulk: the spreadsheet workflow handles a mail campaign; POST /api/v1/qr/batch handles up to 1,000 per request for larger runs merged into print templates.
Semi-unique compromise: where per-customer print is impractical, per-channel codes (one per store, per insert version) still attribute the placement, though not the person, half the value, a tenth of the logistics.

Double-sided incentives, stated plainly

The incentive structure that consistently works gives something to both sides ("give £10, get £10"), because one-sided schemes ask the advocate either to profit from a friend (feels grubby) or to gain nothing (why bother). The give side lowers the friend's first-order risk; the get side compensates the advocate's social capital. Set both values so the pair costs less than your blended acquisition cost, and the scheme funds itself; that comparison, not scan counts, is the number that decides whether the programme survives: see measuring offline-to-online conversion.

Referral rewards are coupons, so coupon fraud applies: self-referral (new accounts redeeming your own code) and farmed sharing on deals sites. Single-use reward tokens, new-customer checks and velocity limits are the standard controls: the full toolkit is on preventing coupon QR fraud.

Print placements that reach the friend

Rank placements by whether they can physically reach a second person:

A keepable referral card in the parcel: wallet-sized, the customer's unique code, designed to be handed over. This is the only placement whose explicit job is transfer. Follow the one-card-one-action rule; a referral card competes badly with a review card in the same box.
The packing slip: order-aware, low cost, reaches the buyer at high attention; fold the referral action into the slip's order page rather than adding a second code.
Receipts at retail, per-transaction codes are easy where the POS can print them.
The product itself, for visible/giftable goods, a hang tag the recipient of a gift can scan.

Print at ≥ 2 × 2 cm, label with the offer ("Give £10, get £10: scan"), and verify a printed proof of each template before the run.

FAQ

How does a referral QR code work?

Each customer gets a unique referral URL encoded as a QR code on cards, slips or their account page. A friend's scan lands on a page crediting the referrer, and both sides receive their incentive after the qualifying purchase.

How do I print a different referral code for every customer?

Export each customer's referral URL and batch-generate codes (bulk tools or a batch API handling up to a thousand items per request), then mail-merge into the print template. For digital surfaces, render the code on demand from an image API.

What referral incentive structure works best?

Double-sided (a reward for the friend and one for the advocate), with the combined cost set below your normal customer acquisition cost. One-sided schemes underperform because they ask the advocate to profit from, or do free work for, a friendship.

How do you prevent referral fraud?

Treat rewards as single-use tokens, verify referred customers are genuinely new, and rate-limit redemptions per referrer. Expect codes to appear on deal sites and decide in advance whether that spread is acceptable acquisition or abuse.