Send push notifications to customers without an app
Sending push notifications to customers used to require your own app – and almost no one installs an app for a single shop. With a stamp card in Apple Wallet or Google Wallet, you can still reach your customers' lock screens. This article explains how it works technically, what you need to know legally, and which messages actually get read.
How push notifications work without an app
Apple Wallet and Google Wallet come pre-installed on every smartphone. When a customer adds your card – via QR code on a display, in just a few seconds – that card is connected to your shop. You can send it messages, and the wallet shows them as notifications on the lock screen, just like a message from an app.
The difference from your own app: you save development time, app store approval, and the hurdle of asking customers to install something. Why this is the better solution for small shops is explained in the article Customer loyalty without your own app.
Which messages you're allowed to send
Legally, there are two types of messages:
- Program messages are part of the stamp card itself: "Stamp 7 of 10", "Your reward is ready", "Card redeemed". They're part of the service the customer requested by adding the card.
- Marketing messages are offers, promotions, and reminders: "Today only: 2 for 1", "We miss you". For these, the customer needs a separate, non-pre-checked box when creating the card.
Sending marketing without that checkbox risks a cease-and-desist letter under competition law. A clean solution separates both types technically and only sends marketing to customers who've consented. For more on handling customer data, see GDPR and loyalty programs.
8 push notifications that actually get read
A good push notification is short, specific, and has a reason. You can adapt these eight templates directly:
- Welcome: "Great to have you here. Your first stamp is on the card – 9 more until your free coffee."
- Almost full: "Just 2 stamps left until your reward. How about tomorrow?"
- Reward ready: "Your card is full. Your free cappuccino is waiting for you."
- Slow day: "Tuesday is double-stamp day. Every visit counts double today."
- Flash sale with deadline: "Today only until 5 PM: cake and coffee for 5 €."
- Win-back: "Haven't seen you in a while. Your next visit gets an extra stamp."
- Birthday: "Happy birthday. A slice of cake is on us today."
- New product: "New with us: cinnamon rolls. Fresh from the oven on Friday."
Avoid generic messages like "Stop by again soon". Every message should answer the question: Why should I come today?
Timing: When push notifications land
Timing often matters more than the text. A few rules of thumb from small shop life:
- Café and bakery: mornings between 7 and 9 AM, when people plan their day.
- Lunch special: between 10:30 and 11:30 AM, before lunch decisions are made.
- Restaurant and bar: afternoons between 3 and 5 PM for the evening.
- Hair salon, beauty, nails: not tied to a specific day – better tied to the cycle: 5 to 6 weeks after the last appointment.
- Retail: Thursday or Friday for the weekend.
Avoid sending messages after 9 PM or before 7 AM.
How often is too often?
The most common reason cards get deleted is too many messages. As a rule of thumb: one to two marketing messages per week, plus the program messages your customer triggers by visiting. If you have nothing concrete to say in a week, don't send anything. A skipped week costs you nothing; a pointless message costs you attention.
Send manually or automatically
Many of the best messages you don't have to write yourself. A win-back message after 30 days without a visit, a birthday offer, or a slow-day booster can be set up once and run automatically – at stampa, these are called "Magic Rules". How win-back works in detail is described in Win back inactive customers.
Send manually only what's situational: the flash sale when the shop is empty, the new product, the holiday promotion. AI can suggest the text so you're not staring at a blank field.
Push, email, SMS, or Instagram?
| Channel | Lands in | Cost per message | Control over reach | Effort for customer |
|---|---|---|---|---|
| Wallet push | Lock screen | included in plan | high: everyone with card | none, card is already there |
| Inbox, often promotions folder | low | medium: email address needed | provide email | |
| SMS | Lock screen | per SMS | high: phone number needed | provide number |
| Instagram post | Feed, if algorithm allows | none | low | follow and open feed |
| Own app | Lock screen | development and maintenance | high, but few installations | install app |
The wallet push combines the reach of SMS with the cost of email and zero effort for the customer. How to use the lock screen as a channel strategically is explained in Lock screen marketing.
What you should measure
After each campaign, take a look at your dashboard: How many customers came in the days after, how many stamps were given, how many cards were redeemed? More important than absolute numbers is comparing with a control group that didn't get the message. That's the only way to know if the message brought visits or if customers would have come anyway.
Conclusion
Sending push notifications to customers works without your own app when the card is in the wallet: short, specific, at the right time, and only with consent for marketing. The most important messages run automatically, the situational ones you write in a minute. With stampa, push notifications, automation, and marketing consent are already built in – free up to 100 active customers, no credit card required. Get started free now.