React with an emoji to acknowledge a message without sending a full reply — quick confirmation that you saw it.

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At a glance

ItemDetail
typereaction
Channel supportOfficial and unofficial
content.message_idProvider message ID from webhook or GET message
content.from_meOptional; defaults to true
content.participantRequired in some group or multi-device contexts

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Request body

FieldRequiredDescription
channel_idYesSender channel ID
toYesRecipient phone number
typeYesreaction
content.message_idYesTarget message ID
content.reactionYesEmoji (empty string removes reaction on some providers)

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Example

curl -X POST "https://api.wazapin.com/v1/messages" \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "channel_id": "wzp_abc123",
    "to": "6281234567890",
    "type": "reaction",
    "content": {
      "message_id": "wamid.HBgL...",
      "reaction": "👍"
    }
  }'

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Endpoint

POST https://api.wazapin.com/v1/messages Authenticate with X-Api-Key. See Authentication.

​
Response

On success, the API returns 201 Created with a message record (status often starts as queued).
201 Created
{
  "data": {
    "id": "9f1fd66d-c37a-4b50-a8c2-b4dca523f9c8",
    "channel_id": "wzp_abc123",
    "to_phone": "6281234567890",
    "type": "text",
    "status": "queued",
    "created_at": "2026-03-04T06:20:10Z",
    "updated_at": "2026-03-04T06:20:10Z"
  }
}
Track delivery with Webhooks or GET /v1/messages/.