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React to messages with emoji, just like users can in the WhatsApp app. Reactions are a lightweight way to acknowledge messages without sending a full reply.

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Adding a Reaction

React to a message with an emoji:
Add Reaction
curl -X POST https://api.buildwithchirp.com/v1/whatsapp/messages \
  -H "Authorization: Bearer YOUR_APP_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "+15551234567",
    "to": "+15559876543",
    "type": "reaction",
    "reaction": {
      "messageId": "msg_wa_2DbBs7GWhGvVNJGrDXr5RG0mBWI",
      "emoji": "👍"
    }
  }'

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Removing a Reaction

Remove a reaction by sending an empty emoji string:
Remove Reaction
curl -X POST https://api.buildwithchirp.com/v1/whatsapp/messages \
  -H "Authorization: Bearer YOUR_APP_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "+15551234567",
    "to": "+15559876543",
    "type": "reaction",
    "reaction": {
      "messageId": "msg_wa_2DbBs7GWhGvVNJGrDXr5RG0mBWI",
      "emoji": ""
    }
  }'

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Request Parameters

ParameterTypeRequiredDescription
typestringYesMust be "reaction"
reaction.messageIdstringYesChirp message ID (msg_wa_*) to react to
reaction.emojistringYesEmoji to add, or empty string to remove

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Supported Emoji

You can use any emoji supported by WhatsApp, including:
  • 👍 👎 ❤️ 😂 😮 😢 🙏
  • All standard Unicode emoji
  • Skin tone variants
Only one reaction per message is allowed. Sending a new reaction replaces any existing reaction from your number.

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Response

Response
{
  "id": "msg_wa_2DbBs7GWhGvVNJGrDXr5RG0mBWI",
  "from": "+15551234567",
  "to": "+15559876543",
  "type": "reaction",
  "status": "queued",
  "timestamp": "2024-01-15T12:00:00.000Z"
}

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Receiving Reactions

When a user reacts to your message, you receive a webhook:
Reaction Webhook
{
  "event": "messages.whatsapp.received",
  "timestamp": "2024-01-15T12:05:00.000Z",
  "data": {
    "message": {
      "id": "msg_wa_3EcCs8HXiHwWOKHsDYs6SH1nCXJ",
      "from": "+15559876543",
      "to": "+15551234567",
      "type": "reaction",
      "direction": "inbound",
      "reaction": {
        "messageId": "wamid.HBgLMTUwMzMwNzk5NzQ...",
        "emoji": "❤️"
      }
    }
  }
}
Use reactions to quickly acknowledge customer messages, confirm actions, or add emotional context to conversations.

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Use Cases

  • Acknowledge receipt: React with 👍 to show you’ve seen a message
  • Express emotions: React with ❤️ to positive feedback
  • Confirm understanding: React with ✅ when a task is complete
  • Show appreciation: React with 🙏 to thank customers