WhatsApp automation for Singapore SMEs: PDPA, the Do Not Call Registry, and getting live this week

Singapore SMEs run on WhatsApp and on rules. The PDPA and the Do Not Call Registry are enforced, and a business that gets messaging wrong hears about it. The good news is that the most useful kind of automation, answering people who message you, sits comfortably inside those rules. Here is how to set it up and stay there.

By Ritchie, ReplyKit · Published 5 September 2026 · 7 min read

The two rules that matter

• PDPA. Collect and use personal data, including phone numbers and chats, for purposes the customer would reasonably expect, tell them, secure it, and let them withdraw consent. The PDPC publishes guidance for SMEs.
• Do Not Call Registry. Marketing messages to Singapore numbers must be checked against the DNC Registry unless you have clear consent. Replying to a customer who messaged you about your services is not a marketing message; sending them a promotion next month is.

So the design rule is simple: automate the replies, not the outreach. An agent that only responds to inbound enquiries, confirms what the customer asked for and reminds them of the appointment they booked never touches the DNC question. This is not legal advice; check with the PDPC guidance or a lawyer for your industry.

Enterprise provider or done-for-you

The official WhatsApp Business API is sanctioned by Meta, supports templated campaigns, and costs a platform fee plus Meta's per-conversation charges; setup takes days to weeks. ReplyKit uses the same official platform but does the setup for you: connect the number through Meta's sign-in in minutes, pay a flat fee with AI included, and pay Meta only for reminder and follow-up templates. Broadcasts go only to contacts who opted in, through approved templates, on the Growth and Pro plans. For a Singapore SME that wants enquiries answered and appointments booked, ReplyKit on a dedicated number is usually the right start; for campaigns, use an enterprise provider and a consent list. Our comparison has the detail.

Language and tone

Singapore customers write in English, Chinese, Malay, Tamil and Singlish, sometimes within one message. The agent replies in the customer's language from a knowledge base you write once, and you can set the register: "friendly, concise, Singapore English, keep prices and addresses exact". Voice notes are transcribed. See the multilingual guide.

Setup in a week

1. Get a dedicated number: a prepaid SIM or an eSIM on a dual-SIM phone, with WhatsApp Business installed.
2. Paste your website and upload your price list; write policies and the unwritten rules as text.
3. Set services and hours so bookings work in the chat.
4. Write instructions with clear boundaries and the handover rule, then run the twenty-message test.
5. Connect the number through Meta's sign-in, put the number on Google Business Profile and your site, and read the first week's conversations.

Frequently asked questions

ReplyKit is an independent product and is not affiliated with or endorsed by Meta or WhatsApp. This article is general guidance for Singapore businesses, not legal advice. Consult the PDPC guidance or a lawyer for your obligations.