Send invoices, receipts and order updates to customers — on WhatsApp

Taking the order is only half the work. The other half is everything after: the invoice, the receipt once they’ve paid, the “your order is ready for pickup,” the reminder about tomorrow’s appointment, the little weekly summary a regular customer likes to get. Most people do all of this by hand — copying numbers into a chat, one message at a time.

If your app already knows the numbers — the order total, what’s paid, what’s due, the appointment time — it can write those messages for you. whacka builds your app so that, in one tap, it composes the right message and opens WhatsApp to the right customer with everything filled in. You read it, and you press send.

From your app to their chat, in one tap

It works the same way the Order button does, just pointed the other direction. Next to an order, an invoice, or an appointment, your app shows a Send on WhatsApp button. Tap it and your app builds the message from the live data on screen — the real total, the real balance, the real date — and opens a chat to that customer’s number with the whole thing written out, ready to go.

Because the message is built fresh each time from what’s in your app, it’s never out of date. Change a price or take a payment, send again, and the new message reflects it — you’re never pasting yesterday’s number into today’s chat.

What you can send

Once your app can talk to a customer’s WhatsApp, a lot of daily admin collapses into one tap:

• An invoice or a quote — the line items, the total, your terms — sent the moment you finish it.
• A receipt — a clean “paid in full, thank you” the customer can keep, with the amount and date.
• Order updates — “your order’s confirmed,” “it’s ready for pickup,” “out for delivery today.”
• Appointment reminders and booking confirmations — the date, the time, where to come.
• A short summary — a weekly total for a regular, a balance due, a simple statement.

Who reaches for this

It tends to show up wherever a business does the work first and settles up after:

• A clinic or salon sending an appointment reminder, then a receipt once the visit’s paid.
• A laundry or repair shop with a simple “your order is ready for pickup.”
• A workshop or design studio sending a quote, then the final invoice, by chat.
• A tutor or small school sending parents a short weekly update or the fees due.
• A shop confirming an order and the delivery details before it goes out.

It works in your language, Arabic and other right-to-left scripts included, so the message reads naturally to the person receiving it.

It’s still personal — you press send

This isn’t a bulk-blasting machine, and that’s on purpose. Your app opens one chat, to one customer, with one message ready — and a person decides to send it. That keeps every message something a real customer is glad to get, not something that feels automated at them. It’s the speed of automation with the manners of a person.

The honest details

The edges, up front:

• You need the customer’s number. The message opens a chat to a phone number your app has — usually one the customer gave you when they ordered or booked.
• Sending is one-at-a-time, by you. Each message opens ready in WhatsApp for a person to send. It’s deliberately not a tool for blasting hundreds of unsolicited messages — that’s how numbers get blocked, and it’s not what this is for.
• Building uses your whacka credits, like everything in whacka. Sending the messages themselves goes through WhatsApp as normal, and costs you nothing extra.

Questions people ask

Does the invoice or receipt include the real amounts?

Yes. The message is composed from the live data in your app at the moment you tap — the actual total, what’s paid, what’s due, the date — so it’s always current and you’re not retyping figures.

Can it send to lots of customers at once?

It’s built for one-at-a-time, personal sending — your app opens a single chat with the message ready, and you send it. That’s deliberate: it keeps your messages welcome and your number safe, rather than turning into mass marketing.

Do I need WhatsApp Business?

No. It opens a chat from your normal WhatsApp to the customer’s number. A Business account is optional and only adds extras if you want them.

Your app already does the hard part — it knows the order, the total, the time. Letting it write the message and open the chat just saves you the copy-and-paste. Build it once, and the after-the-sale part of your day gets a lot shorter.