curl --request POST \
  --url https://cerberus.eazybe.com/staging/api/v2/meta/wabas/{wabaId}/webhook-subscriptions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "overrideCallbackUri": "https://your-app.com/webhooks/whatsapp",
  "verifyToken": "shared-secret"
}
'

{
  "success": true
}