WhatsApp marketing: the complete guide to getting started

WhatsApp has over 2 billion active users, and your customers spend part of their day there. Yet most brands keep betting on saturated channels: overflowing inboxes, impersonal texts, ignored ads. As a result, their messages almost never turn into a real conversation.

WhatsApp marketing changes that equation. It's a direct, personal channel that's read almost instantly. In this guide, we cover everything you need to start the right way: how WhatsApp Business works, the rules to know, the campaigns that pay off, and the classic traps to avoid.

Why WhatsApp beats email and SMS

The difference isn't subtle, it's dramatic. WhatsApp is a personal messenger: a message there is treated like one from a friend, not a promo to archive. The numbers speak for themselves:

• ~98 % open rate, versus around 20 % for email.
• Over 45 % reply rate: your customers actually respond.
• Most messages are read within minutes of being sent.

Where email lands in the promotions tab and SMS is expensive for a limited format, WhatsApp enables a rich conversation: text, images, buttons, and above all an immediate reply. That last point is what turns a marketing channel into a sales channel.

WhatsApp Business vs the regular app

Don't confuse the two. The free WhatsApp Business app works for a small shop replying to a few customers a day. But to send campaigns to hundreds or thousands of contacts, automate follow-ups and work as a team, you need the WhatsApp Business API (Meta's Cloud API). That's what unlocks real WhatsApp marketing.

How the WhatsApp Business API works

The API officially connects you to Meta's infrastructure through a dedicated number (your WABA, or WhatsApp Business Account). Once connected, you can send and receive messages at scale. Two formats coexist: session messages, in fully free text, and templates, models pre-approved by Meta to start a conversation. Understanding the difference between the two is the key to everything else.

The 24-hour rule, explained simply

This is THE thing to internalise. You can only send free-text messages within 24 hours of a contact's last message. Concretely: a customer writes to you at 2pm, and you have until 2pm the next day to reply freely. After that, the window closes, and you need an approved template to re-open the conversation.

This rule isn't an arbitrary constraint: it protects users from spam and forces you to write messages people actually want to reply to. A good platform handles this window automatically for you, and blocks sending if you're out of the window.

Templates or free messages: which to use

• Templates: to initiate contact (campaigns, follow-ups, notifications). They must be approved by Meta, but support personalised variables.
• Session messages: to chat within the 24h window. Free text, perfect for customer service and conversational selling.

Building a clean contact list

A high-performing WhatsApp channel relies on a consented list. Never import purchased numbers: you risk getting your account blocked and, worse, losing your customers' trust. Collect consent where it feels natural:

• At checkout or sign-up, with a clear opt-in checkbox.
• Via a QR code in-store or on your packaging.
• From your website, with a “Chat on WhatsApp” button.
• By syncing your already-consented Shopify or CRM contacts.

7 WhatsApp campaigns that convert

• Abandoned cart: follow up within 1 to 24h with a time-limited code. Often the highest-ROI campaign.
• New arrivals: give your best customers early access.
• Promo codes & flash sales: create urgency with a short offer.
• Appointment reminders: cut no-shows with a simple “YES” confirmation.
• Loyalty: VIP offers, points, birthday messages.
• Re-engagement: wake up inactive customers with a reason to return.
• Follow-up & satisfaction: order confirmation, delivery tracking, review requests.

Anatomy of a message people want to reply to

On WhatsApp, tone is everything. A message that looks like an ad fails; a message that reads like it came from a human works. A few simple principles:

• Personalise: first name, last order, city. Whatever data you have, use it.
• Get to the point: 2 to 3 sentences are enough. Mobile doesn't forgive walls of text.
• One clear call to action: a link, a question, a “YES”.
• One emoji or two, not ten. Restraint builds more trust.

Measure what matters

WhatsApp offers visibility no other channel matches. Track the full journey of each message: delivered, read, replied, then converted. A/B test your variants (two hooks, two offers) and let the data decide. A single change to the first line can double your reply rate.

Staying compliant: GDPR and Meta's rules

• Get explicit consent before any send, and keep a record of it.
• Always offer an easy way to opt out (“STOP”).
• Keep your frequency reasonable: one good message a week beats three too many.
• Protect your number's quality rating: too many blocks and Meta throttles your reach.

5 mistakes that sink your campaigns

• Importing non-consented contacts: the fastest path to a ban.
• Sending too often: over-messaging kills trust.
• Generic messages, with no personalisation or context.
• Ignoring replies: on WhatsApp, not replying is worse than on email.
• Forgetting the 24h window and getting messages blocked.

Getting started with beam

beam brings it all together: contact import and segmentation, campaigns with variables and A/B testing, a shared inbox for your team, detailed analytics and automatic handling of the 24h window. You connect your WhatsApp Business account in one click through Meta's embedded signup, and send your first campaign in minutes, with no technical setup.

In short

WhatsApp isn't just another channel: it's the one where your customers are truly paying attention. A consented list, short and personalised messages, respect for the 24h window and rigorous measurement are enough to make it your best conversion lever. The best time to start was yesterday; the second best is now.