MsgVariantAudio

WebM audio is converted to AAC/M4A for WhatsApp, Instagram, Messenger, Telegram and Twilio MMS; Web Chatt retains WebM. WhatsApp voice=true converts WebM to Ogg/Opus. Converted MMS audio is limited to 500 KiB.

audioUrlstring<uri>required

mimeTypestring

Concrete audio MIME type supported by the selected channel.

voiceboolean

When true, send as a voice note (PTT). When false or omitted, send as a basic audio file. WhatsApp only; voice notes require Ogg with Opus encoding per Meta.

textstring

context object

messageIdstringrequired

MsgVariantAudio

{
  "audioUrl": "string",
  "mimeType": "string",
  "voice": true,
  "text": "string",
  "context": {
    "messageId": "string"
  }
}