Send push notifications to customers – no app needed
Every week without push notifications, loyal customers go to competitors who remind them in time – yet the channel is set up in 5 minutes.
Sending push notifications to customers used to require your own app. Almost nobody installs an app for a single shop. But through a stamp card in Apple Wallet or Google Wallet, you can still reach the lock screen. This article shows how it works, 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 seconds – that card is linked to your shop.
You can send it messages. The Wallet shows them as notifications on the lock screen, just like a message from an app. The difference: you skip development, 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 adding the card.
Sending marketing without that checkbox risks a cease-and-desist letter. A clean solution separates both types technically and sends marketing only to customers who opted in. What else you need to know about customer data is covered in GDPR and loyalty programs.
Take the self-test: would you read this message?
Before you send a message, ask yourself:
- Does the first sentence say what the customer gets out of it?
- Is it clear when the offer expires?
- Would I come by today for this?
- Is the message shorter than two lines on the lock screen?
If you hesitate on any point, rewrite it.
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. Your first stamp is on the card – 9 more until your free coffee."
- Almost full: "Just 2 stamps left until your reward. How about today?"
- Reward ready: "Your card is full. Your free cappuccino is waiting for you."
- Slow day: "Tuesday is double-stamp day. Every visit counts double."
- Flash sale with deadline: "Today only until 5 PM: cake and coffee for €5."
- Win-back: "Long time no see. 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 sometime". Every message should answer: Why should I come today?
Timing: when push notifications land
Timing often matters more than the text. A few rules of thumb from small shops:
- 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.
- Barber, beauty, nails: not tied to a 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 or two marketing messages per week, plus the program messages the customer triggers by visiting.
If you have nothing concrete to say one week, send nothing. A skipped week costs you nothing. A pointless message costs you attention.
What it looks like in practice
A café sends a message Tuesday at 10 AM: "Double-stamp day today – every visit counts double." That day, 40% more customers come with their stamp card than on other Tuesdays. The message took 15 seconds to write.
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 on their own.
At stampa, these automations are called Magic Rules. How win-back works in detail is explained 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: needs email | provide email | |
| SMS | Lock screen | per SMS | high: needs phone number | provide number |
| Instagram post | Feed, if algorithm allows | none | low | follow and open feed |
| Own app | Lock screen | development and maintenance | high, but few installs | install app |
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 happens if you change nothing
Without push notifications, your customers decide spontaneously where to go today. Whoever reminds them in time wins. Every week without this channel, loyal customers go to competitors without you knowing. Setup takes 5 minutes, the risk is zero.
What you should measure
After each campaign, check 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 to a control group that didn't get the message. Only then do you 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, automations, and marketing consent are already built in – free up to 100 active cards, no credit card needed. Start free now.