Your loyalty card system for more regulars
New or replacing an old one: app for iOS & Android, web account and back office.
- Call now: +43 5354 20845
- 80+ projects
- 5.0 on Google
- Clients for 10+ years
- EU & GDPR first
- Directly with the managing director
Why a loyalty card?
A loyalty card turns anonymous purchases into regular customers you know and can reach again. As an app it comes along with every purchase, in the branch and in the online shop. Figures from retail show that your customers are long used to it.
66 %
use the customer card or loyalty programme in the app
Two thirds of grocery retailer app users in Germany use the digital customer card or a loyalty programme in them. Your customers already know it.
49 %
shop more often because of the app
And 50 % buy more, according to a retailer app study. Points and offers give them a reason to come back.
Sources: Bitkom, representative survey of 1,138 smartphone users in Germany, press release of 4 February 2025 (66 % of grocery retailer app users); Simon-Kucher, retailer app study 2024 (49 %, 50 %).
Introduce or replace
wunderwerk builds your loyalty card system wherever you stand today.
No loyalty card yet
You are starting fresh. In the analysis we work out the rules of the programme with you: what earns points, what they are worth, which rewards and offers pay off for you. Then we start small, for example in a pilot branch, and expand what works.
Already a loyalty card
Your current system is getting old, an app is missing, or tills and online shop count separately. We rebuild the system and take over cardholders, points balances and history from your current system.
Four building blocks, one system
A loyalty card system by wunderwerk consists of four parts that work on the same data: the app, the web account, the back office for your team and, if you already have a card, the migration of your existing data. We build all four from one team, so a point counts the same everywhere, at the till, in the online shop and in the app.
The loyalty card moves onto the phone: your customers show the code in the app at the till, see their points balance, redeem rewards and coupons and receive offers by push notification. One codebase with React Native for iPhone and Android, released on the App Store and Google Play.
Not everyone installs an app. In the web account, customers see their points balance and purchases in the browser, change their details and manage their consents, with the same login as in the app. A classic card at the till remains possible if you want it.
Administration for head office and branches: find customers and cards, book or correct points, plan rewards, offers and push notifications. Reports show how many customers are active, which offers work and what is redeemed in which branch. Roles and permissions decide who sees what.
If you already have a loyalty card, we take over cardholders, card numbers, points balances and purchase history from your current system. Trial runs and a reconciliation of the totals show before the cut-over date that nothing is missing. For your customers only one thing changes: the app is added.
New system. Old points stay.
If you replace an existing system, the most delicate part is not the app but the move. Your customers have collected points for years and expect them to still be there on the day of the switch. That is why wunderwerk plans the data migration from the start, not just before go-live.
- 1.Check what you have
We look at the export, data quality and duplicates of your current system and agree what moves with you: cardholders, card numbers, points balances and history.
- 2.Map and test
Every field gets its place in the new system. Trial migrations with your real data and a reconciliation of card counts and points totals show that nothing is missing.
- 3.Switch on the cut-over date
On the agreed date we migrate the data for good and switch over the tills and online shop. If the old system can export the card numbers, they stay valid and no card swap is needed.
- 4.Invite your customers
Existing cardholders link their card in the app or web account with a few details and find their points balance waiting for them.
Connected to till, shop and inventory
Points only count if they are booked where people shop. wunderwerk connects the loyalty card system to your existing systems through interfaces (APIs) instead of maintaining data twice.
If a system has no interface, we find a way in the analysis, for example through database access or export and import. More under Process automation and interfaces.
- Till in the branch
Scan the card or app at the till, credit points, redeem rewards and coupons, right in the point-of-sale system.
- Online shop, for example Shopware
Collect and redeem points online too, with the same customer account. Whether Shopware, Shopify, WooCommerce or your own shop.
- Inventory management and ERP
Items, prices and promotions come from inventory management, sales go back for the reports.
- Apple Wallet and Google Wallet (option)
The loyalty card in the phone wallet as well, for customers who do not want to install an app. Points balance and offers update there too.
Data protection, built in
A loyalty card system processes the data of many customers, often for years. That is why wunderwerk plans GDPR data protection from the start instead of retrofitting it.
- Hosting in the EU
Back office and customer data are stored in the EU, on servers in Germany, or on request in your own infrastructure.
- Separate consents
We ask for advertising, push notifications and analytics separately; customers change their choice at any time in the app or web account.
- Only the data you need, clear deletion periods
Data minimisation and a deletion concept for inactive accounts are part of the project, as is the data processing agreement.
- Roles, permissions and audit log
Each branch sees only what it needs, and access to customer data is logged.
Three phases to your new system
wunderwerk builds your loyalty card system in three phases: analysis, MVP and rollout. Each phase has a clear result and a cost range, and you decide after each phase whether to continue.
- 1
Analysis & concept
If you start fresh, we work out the rules of your programme with you; if you replace a system, we write down the existing ones: what earns points, what they are worth, which rewards there are. We also look at tills, online shop and, where there is one, your current system and its data export. Within a few days you receive the concept, for a switch also the migration plan, and a transparent effort estimate.
- 2
MVP in 4 to 8 weeks
The first usable version: app with digital card and points balance, the back office for your team, the till integration and, for a switch, a trial migration with your real data. Ideal for a test in a pilot branch before all branches switch.
- 3
Expansion & switch-over
Web account, offers, push notifications, online shop and, on request, the wallet card are added. For a switch we migrate all cards and points on the cut-over date and switch the branches over; for a fresh start we plan the launch in the branches with you. Either way we support the rollout with your team. Afterwards we stay at your side for operation, maintenance and new features if you wish.
What our clients say:
A selection of our client feedback.
★★★★★Many thanks for building and looking after our online learning platform.
We can wholeheartedly recommend Christoph and his entire team.
Whatever we ask for, almost everything is made possible, and the ongoing personal contact works brilliantly too. Many thanks.
We run the online shop thecurtain.shop for made-to-measure curtains and Roman blinds.
Working with wunderwerk was excellent in every respect.
Thanks to their work, we can offer our customers an intuitive, professional shopping experience that perfectly reflects our craftsmanship. Many thanks for the great collaboration!
Very likeable wunderworkers! Fast, uncomplicated, competent and always ready to save the world!
Highly competent support. Well advised all round.
Chris knows how to solve a problem. Quality has a name: wunderwerk.io
We had the wunderworkers develop bespoke industrial software for creating recipes for a highly sensitive industrial process.
The collaboration was extremely professional from the outset: the team quickly understood our complex requirements, implemented them precisely and always paid close attention to maximum reliability and security. I would particularly like to highlight their technical know-how, clean documentation and fast response times for questions or change requests.
The recipe editor is now running in several plants in Sweden, Italy and the Czech Republic.
The software runs reliably, is intuitive to use and our customers are completely satisfied. We can recommend wunderwerk without reservation!
wunderwerk built a digital solution for my photography business that has been running stably and reliably for years. The support is top-notch, reliable and competent. I can only recommend them.
Christoph Niedermoser and his team impressed us with their professionalism, precision and reliability, both in the consulting phase and in the implementation that followed.
Our requirements were implemented perfectly, and the GPS tracking system has now been in successful use in several of our facilities for a number of years.
Chris and his team gave me superb advice on my app idea. Uncomplicated, fast and professional! Highly recommended!
We have already implemented and completed several projects together over the past few years.
Professional implementation and personal contact.
Highly recommended!
Perfect implementation of our
billiards platform.
A very pleasant collaboration. It was fun! Highly recommended!
Thank you very much!
I will get back to you as soon as possible!
You can also book an appointment in my calendar right away: Book an initial consultation
Why us?
Questions about loyalty card systems
Your question is not listed? We answer it in the free initial consultation, directly with the managing director.
- Or call now: +43 5354 20845
What does a loyalty card system cost?
At wunderwerk the costs depend mainly on five things: the building blocks you need (app, web account, back office, wallet card), the rules of your rewards programme, the number of interfaces to tills, online shop and inventory management, for a switch, the state of the data in your current system and the design ambition. That is why there is no flat price but a transparent effort estimate after the analysis. You start with a deliberately small MVP and invest step by step. You get a first assessment through the cost calculation or in the free initial consultation.
Is a loyalty card system worth it for us?
Usually when you have many returning customers, run several branches or a branch and an online shop, and want to address your customers more specifically. For a single shop with a simple stamp card, a ready-made solution is often enough; we tell you openly in the initial consultation. A solution of your own pays off when the programme has to fit your till, your shop and your rules.
We do not have a rewards programme yet. Do you help with the rules?
Yes. In the analysis, wunderwerk works out with you what earns points, what they are worth, which rewards and offers there are and how the programme pays off for you. We start deliberately simple, test in a pilot branch and adjust the rules as soon as real data shows what works.
How long does it take to the finished system?
At wunderwerk, an MVP with app, back office and till integration is usually ready after 4 to 8 weeks and can be tested in a pilot branch. The complete system with web account, online shop and all branches switched over usually takes three to six months, depending on scope. For a switch, we set the cut-over date for the data migration together, for example outside your busiest weeks.
Do our customers need a new card?
As a rule, no. If your current system can export the card numbers, wunderwerk takes them over into the new system: the existing cards keep working at the till, and customers link their card in the app or web account. Whether this works for you is clarified in the analysis, before development starts.
What happens to the collected points and the history?
They move with you. wunderwerk takes over points balances, redeemed rewards and purchase history from the current system; trial migrations and a reconciliation of card counts and points totals show before the cut-over date that nothing is missing. Anything that cannot be migrated cleanly we discuss with you beforehand, not afterwards.
Can customers take part without the app?
Yes. Customers without the app use the web account in the browser or keep using their card at the till; on request, a card for Apple Wallet and Google Wallet is added. Every route leads to the same customer account and the same points balance.
Does it work with our till and our online shop?
Usually yes. wunderwerk connects point-of-sale systems, inventory management and online shops such as Shopware, Shopify or WooCommerce through interfaces (APIs). Which interfaces your till offers we check in the analysis; if one is missing, we find a way, for example through database access or export and import, or coordinate with the manufacturer of your till.
Can a loyalty card system be GDPR-compliant?
Yes. wunderwerk asks for consent to advertising, push notifications and analytics separately, stores only the data needed, sets deletion periods and hosts in the EU, on servers in Germany or in your own infrastructure. Roles and permissions decide who at head office and in the branches sees which customer data; a data processing agreement is included.
Who runs and maintains the system after launch?
wunderwerk, if you wish: hosting in the EU, monitoring, maintenance, updates for new iOS and Android versions, support and new features, by the same small team that built the system. The app is published under your name; we set up the developer accounts for the App Store and Google Play in your name. We have been working with many clients for more than ten years.
We already have a loyalty app. Can you take it over?
Yes, after a paid technical analysis. wunderwerk checks code, architecture, security, documentation and the rights to the source code and shows whether the existing app can be developed further or a rebuild is more economical. More under Software modernisation.
Own solution or ready-made rewards platform?
A ready-made platform is quick to set up but does not always fit your till, your shop and the rules of your programme, and the customer data sits with the provider. A solution by wunderwerk is tailored to your programme and your systems, built with open technologies and properly documented, so it does not depend on a single provider. Which route is more economical for you, we tell you openly in the initial consultation.
Let us talk about your loyalty card.
In 30 minutes with the managing director, we clarify what a loyalty card system does for you, what it looks like, how existing cards and points move and what you can expect. Free and non-binding.