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You need: an admin login, and the phone that has your WhatsApp Business number on it.
1

Add the number

Click + on the far left of the inbox (on a phone, open ☰ first). Give the number a name your team will recognise, like “Main shop”.
2

Read and accept the note

Read the short note about linking by QR code, tick the box, then tap Show QR code.
3

Scan from your phone

On the phone with that number, open WhatsApp → ⋮ or Settings → Linked devices → Link a device, and scan the code on screen.
4

Wait for your chats

Chats start loading straight away. Older messages arrive over the next few minutes.
Keep using WhatsApp on the phone as normal, and open it at least once every 14 days. Otherwise WhatsApp unlinks the inbox and you’ll need to scan again.

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More than one number

Repeat the steps above for each number. Every number shows on the left, and all their chats come into the same inbox. How many numbers you can add depends on your plan.

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If a number drops off

Admins get a notification, and the number shows Scan QR on the left. Click it and scan again from the phone, the same way as above. Your chats are kept.
Linking by QR code is not an official WhatsApp product. Please read Safe use of WhatsApp so your number stays in good standing.