How to Set Up WhatsApp Customer Support From Scratch

If your business has never offered WhatsApp support before, this is the checklist: what you need, in what order, before your first customer message arrives. If your team already has WhatsApp connected and you specifically want the shared-inbox and team side of it, see our shared inbox setup guide instead — this post starts one step earlier, from having nothing set up at all.

Step 1: Decide on a number

You need a phone number dedicated to WhatsApp Business API that isn’t already registered to a personal WhatsApp account. Most businesses either buy a new number specifically for this, or migrate an existing number they already publish (note: once migrated to the API, that number can no longer be used in the regular WhatsApp app).

Step 2: Create a Meta Business Account

Create a free Meta Business Account (formerly Facebook Business Manager) at business.facebook.com if you don’t already have one. Meta will ask for basic business verification details — most businesses are approved within 1-3 business days.

Step 3: Choose a platform and connect your number

WhatsApp Business API doesn’t have its own standalone interface — you connect it through a provider like Resolvenyx, which handles the technical setup. In Resolvenyx, this takes about 10 minutes:

1. Go to Settings → Inboxes → WhatsApp and start the connection flow
2. Enter your WhatsApp Business Account ID, phone number ID, and access token from Meta’s Developer Console
3. Copy the webhook callback URL into Meta so incoming messages are delivered to your inbox
4. Set a verify token in both places to authenticate the webhook
5. Send a test message to confirm the connection is live

Step 4: Get your message templates approved

WhatsApp requires pre-approved templates for any message that starts a conversation (i.e. you messaging a customer first, outside their 24-hour reply window). Draft your most common outbound messages — order confirmations, appointment reminders, shipping updates — and submit them for Meta’s review, which typically takes a few hours. Replies to customer-initiated messages within the 24-hour window don’t need a template; you can send free-form text.

Step 5: Add your team and set basic routing

Invite your agents, assign roles (Admin or Agent), and decide on a starting routing approach — manual assignment from an unassigned queue is the simplest starting point for a small team; auto-routing rules and team inboxes can come once you understand your actual message volume and patterns.

Step 6: Set expectations before you announce the number

Before publishing your new WhatsApp number anywhere, decide and configure:

• Working hours and what happens to messages outside them (an out-of-hours auto-reply, at minimum)
• A target first-response time your team can realistically hit
• Where the number will be published — website, email signature, receipts, social bios — and whether you’ll roll it out gradually or all at once

Step 7: Go live and monitor closely for the first two weeks

Once live, watch response times and volume closely for the first couple of weeks. This is when you’ll discover whether your routing setup, team size, and working hours actually match real demand — adjust before scaling up promotion of the number further.

What’s next

Once the basics are live, the highest-leverage next steps are usually: quick replies for your most common questions, an AI agent to handle simple FAQs automatically, and converting complex conversations into tickets so nothing gets lost. None of that needs to happen on day one — get a clean, reliable basic setup live first.