How to Set Up a Shared WhatsApp Inbox for Your Team

A shared WhatsApp inbox gives your entire team access to a single WhatsApp Business number — with no credential sharing, no double replies, and full visibility into every conversation.

Here's exactly how to set one up from scratch.

Prerequisites: What You Need Before You Start

• A WhatsApp Business API number (not the WhatsApp Business app — those are different things)
• A Facebook Business Manager account (required for the WhatsApp Business API)
• A shared inbox platform (One Inbox, Trengo, Respond.io, etc.)

If you're currently using the WhatsApp Business app, you'll need to migrate. This means registering your number with a BSP (Business Solution Provider) or Meta directly. The process takes 1–3 business days.

Step 1: Get Access to the WhatsApp Business API

There are two paths:

Option A: Via a platform that acts as BSP. Many shared inbox tools (including One Inbox) are Meta BSPs or work with BSPs. You connect through them directly — they handle the API setup.

Option B: Via Meta directly. You apply for Cloud API access through Meta's Business Manager. More control, but more complex setup.

For most small and mid-size businesses, Option A is faster and requires no technical background.

Step 2: Connect to Your Shared Inbox Platform

Once you have API access, connect it to your inbox platform:

1. Go to your platform's Connections or Integrations settings
2. Select WhatsApp Business API
3. Follow the OAuth flow to connect your Facebook Business Manager
4. Select the phone number to activate

You'll see the WhatsApp number appear in your inbox within minutes.

Step 3: Invite Your Team

Add each agent as a user with appropriate permissions:

• Agents — can view and reply to assigned conversations
• Team Leads — can assign conversations, view all agents' queues
• Admins — full access including settings and reporting

Best practice: don't give everyone admin. Scoped permissions reduce mistakes.

Step 4: Set Up Assignment Rules

This is the most important configuration step. Assignment rules determine who handles what:

• Round-robin — new conversations auto-assign equally across available agents
• Keyword routing — "returns", "broken", "damaged" → Support team; "price", "quote", "buy" → Sales team
• Language routing — detect Arabic or English and route accordingly
• Time-based routing — after-hours conversations queue for first-available or go to AI

Step 5: Build Your Saved Replies Library

Before going live, set up saved replies for your top 20 most common questions. Every agent can insert these with a shortcut. This single step typically cuts average handling time in half.

Step 6: Configure Auto-Responses

Set up at minimum:

• Welcome message — sent when a new conversation starts
• Away message — sent outside business hours with estimated response time
• AI responder (optional but high-value) — handles conversations autonomously when agents are busy or offline

What to Measure After Launch

Within the first week, watch:

• First response time — how long from customer message to first agent reply
• Missed conversations — any conversation with zero replies after 1 hour
• Agent load — is work distributed evenly or is one agent drowning?

Adjust your assignment rules based on what you observe. Most teams hit a stable workflow within 1–2 weeks.

One Inbox includes all of this — WhatsApp API connection, team management, assignment rules, saved replies, and AI responder — in a single platform. Free to start.