curl --request POST \
  --url https://api.flowmod.ai/message/sendAudio/{instanceName} \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --data '
{
  "number": "5511999999999",
  "audio": "<string>",
  "encoding": true,
  "delay": 1200
}
'

{
  "status": 201,
  "error": false,
  "response": {
    "key": {
      "id": "<string>",
      "fromMe": true,
      "remoteJid": "<string>"
    },
    "message": {},
    "messageTimestamp": 123,
    "status": "PENDING",
    "pushName": "<string>"
  }
}