curl --request POST \
  --url https://apicorp.algartelecom.com.br/telecom/product-Inventory-management/management/v1/sms/request \
  --header 'Content-Type: <content-type>' \
  --header 'access_token: <access_token>' \
  --header 'client_id: <client_id>' \
  --data '
{
  "flash": "true",
  "text": "string",
  "sendAt": "string",
  "msisdns": "string"
}
'

import requests

url = "https://apicorp.algartelecom.com.br/telecom/product-Inventory-management/management/v1/sms/request"

payload = {
    "flash": "true",
    "text": "string",
    "sendAt": "string",
    "msisdns": "string"
}
headers = {
    "Content-Type": "<content-type>",
    "client_id": "<client_id>",
    "access_token": "<access_token>"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'Content-Type': '<content-type>',
    client_id: '<client_id>',
    access_token: '<access_token>'
  },
  body: JSON.stringify({flash: 'true', text: 'string', sendAt: 'string', msisdns: 'string'})
};

fetch('https://apicorp.algartelecom.com.br/telecom/product-Inventory-management/management/v1/sms/request', 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://apicorp.algartelecom.com.br/telecom/product-Inventory-management/management/v1/sms/request",
  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([
    'flash' => 'true',
    'text' => 'string',
    'sendAt' => 'string',
    'msisdns' => 'string'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: <content-type>",
    "access_token: <access_token>",
    "client_id: <client_id>"
  ],
]);

$response = curl_exec($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://apicorp.algartelecom.com.br/telecom/product-Inventory-management/management/v1/sms/request"

	payload := strings.NewReader("{\n  \"flash\": \"true\",\n  \"text\": \"string\",\n  \"sendAt\": \"string\",\n  \"msisdns\": \"string\"\n}")

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

	req.Header.Add("Content-Type", "<content-type>")
	req.Header.Add("client_id", "<client_id>")
	req.Header.Add("access_token", "<access_token>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://apicorp.algartelecom.com.br/telecom/product-Inventory-management/management/v1/sms/request")
  .header("Content-Type", "<content-type>")
  .header("client_id", "<client_id>")
  .header("access_token", "<access_token>")
  .body("{\n  \"flash\": \"true\",\n  \"text\": \"string\",\n  \"sendAt\": \"string\",\n  \"msisdns\": \"string\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://apicorp.algartelecom.com.br/telecom/product-Inventory-management/management/v1/sms/request")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = '<content-type>'
request["client_id"] = '<client_id>'
request["access_token"] = '<access_token>'
request.body = "{\n  \"flash\": \"true\",\n  \"text\": \"string\",\n  \"sendAt\": \"string\",\n  \"msisdns\": \"string\"\n}"

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

"Created"

{
  "errors": "Parameter not found"
}

{
  "valueInBytes": 1235
}

{
  "errors": "O acesso ao recurso foi negado."
}

{
  "errors": "URI de API/Recurso inexistente para processamento."
}

{
  "errors": "Parameter not found"
}