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React to an inbound message by its message_id (the wamid from the webhook). Send an empty emoji string to remove a reaction.

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Request

curl -X POST "${WHATSAPP_API_URL}/${WHATSAPP_PHONE_NUMBER_ID}/messages" \
  -H "Authorization: Bearer ${WHATSAPP_ACCESS_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
  "messaging_product": "whatsapp",
  "to": "15551234567",
  "type": "reaction",
  "reaction": {
    "message_id": "wamid.HBgLM...",
    "emoji": "\\ud83d\\udc4d"
  }
}'