WhatsApp Business API in Singapore: How It Works, What It Costs and How Online Sellers Use It
The WhatsApp Business API connects your business number to software instead of one phone. Singapore sellers use it to answer every chat automatically, send order confirmations and delivery updates, take payment by link and book same-day delivery. You get it through a provider such as AeroChat, which connects your number with Meta’s embedded signup. Meta charges per delivered message at Singapore’s own rate, and you can keep the WhatsApp Business app on the same number.
WhatsApp is the default way many Singapore customers contact a shop, whether they are asking about stock, a delivery slot or a corporate order. The free WhatsApp Business app works while one person can keep up. Once several staff share the number, or you want order messages sent from your store automatically, you need the API. Meta calls it the WhatsApp Business Platform, and the version most businesses use today is the Cloud API.
WhatsApp Business app vs the API
| WhatsApp Business app | WhatsApp Business API | |
|---|---|---|
| Who replies | You or your staff, on a phone or linked devices | Software such as AeroChat, plus your team in a shared inbox |
| Automation | Greeting, away message and quick replies | Full workflows connected to your store, payment gateway and courier |
| Messages after 24 hours | Typed and sent by hand | Approved templates (utility, marketing, authentication) |
| Cost | Free app | Meta’s per-message fees plus your provider’s plan |
With coexistence you keep the app on your phone and run the API on the same number. More detail in WhatsApp app vs API and multiple users on one number.
How Meta prices WhatsApp messages for Singapore
As of November 2026, from Meta’s WhatsApp Business Platform pricing documentation:
- Per message. Meta charges per delivered message sent by the business, not per conversation. This model started on 1 July 2025.
- By category. Template messages are marketing, utility or authentication, and each has its own rate.
- By country. The rate depends on the country calling code of the recipient’s number. Singapore (+65) is its own market on Meta’s rate card. A message to a Malaysian (+60) customer is charged at Malaysia’s rate.
- Customer messages are free. Messages customers send you cost nothing.
- Service replies. From 1 October 2026, each business phone number gets 1,000 free service messages a month. Further service messages are charged. Utility templates sent inside an open 24-hour window are charged from the same date.
Meta publishes the current rates in its rate cards. See WhatsApp pricing for how the categories and the 24-hour window work, and AeroChat pricing for the plans.
What you need to start
- A Meta business portfolio.
- A phone number that can receive a verification code. It can be the number you already use in the WhatsApp Business app.
- A display name that meets Meta’s rules.
You can start before your business is verified with Meta. Verification raises your messaging limits. See how to get the WhatsApp Business API and choosing a solution provider.
What Singapore online sellers run on it with AeroChat
- Answer every chat from store data. Stock, price, delivery and order status, from Shopify, WooCommerce, Wix or a Google Sheets store, in English, Singlish, Chinese or Malay.
- Take payment in the chat. Airwallex is built in (open an account if you don’t have one). If you already use Stripe or HitPay, they connect through their APIs. Payment is detected automatically.
- Book same-day delivery through Lalamove or GrabExpress, or update your own drivers’ jobs in Detrack.
- Send order and delivery updates as utility templates. See order confirmation and delivery updates.
- Handle business orders. Quote, take the order and raise the invoice in Xero or QuickBooks Online. See B2B reorders.
- Send broadcasts to customers who opted in, as marketing templates. See WhatsApp broadcasts.
Customer: Hi, can my order #8105 come before 6pm today? I won’t be home after. (example)
AeroChat: To keep your order private, can you confirm the phone number you ordered with?
Customer: 9123 4567
AeroChat: Thanks. Order #8105 is packed and not yet booked. I can book a same-day delivery that arrives before 6pm for S$12 (example). Shall I add it?
Customer: Ok can.
AeroChat: Here’s the S$12 payment link. Once it’s paid I’ll book the rider and send you the tracking link.
In the store: the delivery fee is added to order #8105 once paid, and the Lalamove booking is made.
Copy this into AeroChat
When a customer asks for a faster or timed delivery on WhatsApp, follow these steps.
- Ask for the phone number or email they ordered with, and match it to the order in our store.
- If the order is packed and not yet booked, get a Lalamove quote (example) to their address for the time they asked.
- Tell them the fee in S$ and ask if they want it.
- If yes, send an Airwallex payment link for the fee.
- When the payment comes through, book the delivery, add the fee and the booking to the order, and send the tracking link.
- If the order has already shipped, tell them the current tracking status instead.
Reply in the customer’s language, including Singlish and Chinese.
How to set it up with AeroChat
- Sign up for AeroChat and start your 7-day free trial.
- Connect your WhatsApp number through Meta’s embedded signup. Keep the WhatsApp Business app on it with coexistence if you want.
- Connect your store. Shopify, WooCommerce and Wix are built in.
- Describe your workflows in your own words, or paste the recipe above. Add your gateway or courier keys in the dashboard.
- Submit your order templates for approval and turn the workflows on.
Questions
Can several staff use the same WhatsApp number?
Yes. On the API your team shares one inbox in AeroChat, and AeroChat answers the chats your rules cover. See multiple users.
How do I send messages after 24 hours?
Outside the 24-hour customer service window, a business-initiated message needs an approved template, utility or marketing, and the customer’s opt-in. See message templates and template approval.
Can I get the green tick?
Verification with Meta is a step towards it. See the official business account guide.
Which provider should I use in Singapore?
Compare what each provider connects to, not only the message price. See the best WhatsApp chatbot in Singapore and the best WhatsApp API provider for online sellers.
Using a different system? If it has a public API, it connects to AeroChat the same way: describe what you want, paste in its key, and it runs.
Can’t find your tool? Message us in the chat on this page and we’ll tell you how it connects.
Put your WhatsApp number on the API
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On Shopify? Install AeroChat from the Shopify App Store.