You are almost there!
You have successfully connected your WhatsApp account to Rechatbox. Now, let's set up webhooks so that Rechatbox can receive messages from your WhatsApp account.
Step 1
Locate and copy the Webhook URL and Verify Token from the WhatsApp setup page inside Rechatbox.

Step 2
Go to your Facebook Developer dashboard and click on the Webhooks section (fig1). Select WhatsApp Business Account from the dropdown (fig2), and click Subscribe to this Object (fig3)
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Step 3
A popup will appear where you can paste the Webhook URL and Verify Token, fill in and click Verify and Save.
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Done! Your WhatsApp account is now connected to Rechatbox. π