curl --request POST \
  --url https://api02.frconnect.com.br/v2/whatsapp/message/sendText \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --header 'X-Instance-Token: <x-instance-token>' \
  --data '
{
  "message": {
    "to": "<string>",
    "msg": "<string>",
    "status": "pending",
    "scheduled_at": ""
  },
  "messagetype": "texto"
}
'

import requests

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

payload = {
    "message": {
        "to": "<string>",
        "msg": "<string>",
        "status": "pending",
        "scheduled_at": ""
    },
    "messagetype": "texto"
}
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({
    message: {to: '<string>', msg: '<string>', status: 'pending', scheduled_at: ''},
    messagetype: 'texto'
  })
};

fetch('https://api02.frconnect.com.br/v2/whatsapp/message/sendText', 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/sendText",
  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([
    'message' => [
        'to' => '<string>',
        'msg' => '<string>',
        'status' => 'pending',
        'scheduled_at' => ''
    ],
    'messagetype' => 'texto'
  ]),
  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/sendText"

	payload := strings.NewReader("{\n  \"message\": {\n    \"to\": \"<string>\",\n    \"msg\": \"<string>\",\n    \"status\": \"pending\",\n    \"scheduled_at\": \"\"\n  },\n  \"messagetype\": \"texto\"\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/sendText")
  .header("X-Instance-Token", "<x-instance-token>")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"message\": {\n    \"to\": \"<string>\",\n    \"msg\": \"<string>\",\n    \"status\": \"pending\",\n    \"scheduled_at\": \"\"\n  },\n  \"messagetype\": \"texto\"\n}")
  .asString();

require 'uri'
require 'net/http'

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

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  \"message\": {\n    \"to\": \"<string>\",\n    \"msg\": \"<string>\",\n    \"status\": \"pending\",\n    \"scheduled_at\": \"\"\n  },\n  \"messagetype\": \"texto\"\n}"

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

{
  "success": true,
  "message": "Mensagem enviada com sucesso.",
  "messageId": "550e8400-e29b-41d4-a716-446655440000",
  "status": "send"
}

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

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

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