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Overview

To reply to an existing message, simply include the messageId attribute in the body of any send endpoint (text, image, audio, etc). The messageId is the ID of the original message you want to reply to. You can get the messageId in two ways:
  • Sent messages — returned in the API response when sending
  • Received messages — received via webhook

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Example

Replying to a message with text using the /send-text endpoint: 
{
  "phone": "5511999999999",
  "message": "Thanks for reaching out!",
  "messageId": "3999984263738042930CD6ECDE9VDWSA"
}
This works for /send-image, /send-audio, /send-video, /send-document, /send-sticker, and /send-contact as well — just add the messageId field.
The response structure is identical to Z-API. Your existing code that processes these returns will continue working without changes.
The privateAnswer attribute (private reply in groups) from Z-API is not compatible with the official API and is not available in this version.