ZEzenzap
Messages

Add a reaction to a message

Add an emoji reaction to a message. The bot must be a member of the channel.

This endpoint is idempotent per {messageId, bot, reaction}:

  • Returns 201 when a new reaction is created
  • Returns 200 when the same reaction already exists for this bot
post/v2/messages/{messageId}/reactions

Request

Path parameters

messageIdstring uuid required

The message ID to react to

Headers

X-Signaturestring
Example:a3d5f8e7c2b1d4f6a8e9c7b5d3f1a2e4b6c8d0f2e4a6b8c0d2e4f6a8b0c2d4e6

HMAC signature of the request for authentication and replay protection.

Required only when authenticating with a static API key. If you are using an OAuth access token (issued by POST /oauth/token), omit this header — the JWT carries all the authentication and integrity guarantees.

Replay Protection: The signature includes a timestamp to prevent replay attacks. Requests with timestamps older than 5 minutes are rejected.

The signature payload differs by HTTP method:

  • POST/PUT/PATCH/DELETE: HMAC-SHA256 of {timestamp}.{body}
  • GET: HMAC-SHA256 of {timestamp}.{uri}

The signature is calculated as:

  1. Get the current Unix timestamp in milliseconds
  2. Determine the payload:
    • For POST/PUT/PATCH/DELETE: Use {timestamp}.{body} where body is the request body
    • For GET: Use {timestamp}.{uri} where uri is the full request URI (e.g., /v2/members?limit=10)
  3. Calculate HMAC-SHA256 of the combined payload using your API secret
  4. Hex-encode the output
  5. Include the timestamp in the X-Timestamp header

Example for GET request to /v2/members?limit=10:

timestamp = 1699564800000
payload = "1699564800000./v2/members?limit=10"
signature = HMAC-SHA256(secret, payload)
X-Signature: hex(signature)
X-Timestamp: 1699564800000

Example for POST request with body {"topicId":"123","text":"Hello"}:

timestamp = 1699564800000
payload = '1699564800000.{"topicId":"123","text":"Hello"}'
signature = HMAC-SHA256(secret, payload)
X-Signature: hex(signature)
X-Timestamp: 1699564800000

For multipart/form-data requests, sign the exact raw request body bytes (including boundaries and file bytes) as transmitted.

X-Timestampinteger
Example:1699564800000

Unix timestamp in milliseconds when the request was created. Used for replay protection — requests older than 5 minutes are rejected.

Required only when authenticating with a static API key. Omit when using an OAuth access token.

Request body

reactionstring required

Emoji reaction to add

Example request

{
  "reaction": "👍"
}

Response

Reaction already existed

idstring uuid

Reaction ID

messageIdstring uuid

Message ID the reaction belongs to

reactionstring

The reaction emoji

createdAtinteger

Unix timestamp in milliseconds

Example response

{
  "id": "990e8400-e29b-41d4-a716-446655440005",
  "messageId": "660e8400-e29b-41d4-a716-446655440001",
  "reaction": "👍",
  "createdAt": 1699564800000
}

Changes