curl --request POST \
  --url https://api02.frconnect.com.br/v2/whatsapp/message/sendAudio \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --header 'X-Instance-Token: <x-instance-token>' \
  --data '
{
  "to": "5584999988146",
  "audio_base64": "<conteúdo_base64_do_áudio>",
  "mimetype": "audio/ogg",
  "whatsapp_mode": "private"
}
'

import requests

url = "https://api02.frconnect.com.br/v2/whatsapp/message/sendAudio"

payload = {
    "to": "5584999988146",
    "audio_base64": "<conteúdo_base64_do_áudio>",
    "mimetype": "audio/ogg",
    "whatsapp_mode": "private"
}
headers = {
    "X-Instance-Token": "<x-instance-token>",
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-Instance-Token': '<x-instance-token>',
    'X-API-Key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    to: '5584999988146',
    audio_base64: '<conteúdo_base64_do_áudio>',
    mimetype: 'audio/ogg',
    whatsapp_mode: 'private'
  })
};

fetch('https://api02.frconnect.com.br/v2/whatsapp/message/sendAudio', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api02.frconnect.com.br/v2/whatsapp/message/sendAudio",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'to' => '5584999988146',
    'audio_base64' => '<conteúdo_base64_do_áudio>',
    'mimetype' => 'audio/ogg',
    'whatsapp_mode' => 'private'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>",
    "X-Instance-Token: <x-instance-token>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api02.frconnect.com.br/v2/whatsapp/message/sendAudio"

	payload := strings.NewReader("{\n  \"to\": \"5584999988146\",\n  \"audio_base64\": \"<conteúdo_base64_do_áudio>\",\n  \"mimetype\": \"audio/ogg\",\n  \"whatsapp_mode\": \"private\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-Instance-Token", "<x-instance-token>")
	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api02.frconnect.com.br/v2/whatsapp/message/sendAudio")
  .header("X-Instance-Token", "<x-instance-token>")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"to\": \"5584999988146\",\n  \"audio_base64\": \"<conteúdo_base64_do_áudio>\",\n  \"mimetype\": \"audio/ogg\",\n  \"whatsapp_mode\": \"private\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api02.frconnect.com.br/v2/whatsapp/message/sendAudio")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-Instance-Token"] = '<x-instance-token>'
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"to\": \"5584999988146\",\n  \"audio_base64\": \"<conteúdo_base64_do_áudio>\",\n  \"mimetype\": \"audio/ogg\",\n  \"whatsapp_mode\": \"private\"\n}"

response = http.request(request)
puts response.read_body

{
  "status": 200,
  "statusmessage": "pending",
  "message_id": "3EB057EDBFA3CAF3521059",
  "taxa": 0
}

{
  "success": false,
  "message": "Token inválido."
}

{
  "success": false,
  "message": "Campanha não encontrada."
}

{
  "success": false,
  "message": "Instância desconectada."
}

{
  "success": false,
  "message": "Erro interno do servidor."
}