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const credentials = btoa("usuario@email.com:senha123");

const response = await fetch("https://api.hotmobile.com.br/Sms/ConsultaSaldo", {
  headers: {
    Authorization: `Basic ${credentials}`,
  },
});

const saldo = await response.json();

<?php
$credentials = base64_encode("usuario@email.com:senha123");

$ch = curl_init("https://api.hotmobile.com.br/Sms/ConsultaSaldo");
curl_setopt($ch, CURLOPT_HTTPHEADER, [
  "Authorization: Basic {$credentials}",
]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$saldo = json_decode(curl_exec($ch), true);

using var client = new HttpClient();

var token = Convert.ToBase64String(
  Encoding.UTF8.GetBytes("usuario@email.com:senha123")
);

client.DefaultRequestHeaders.Authorization =
  new AuthenticationHeaderValue("Basic", token);

var saldo = await client.GetFromJsonAsync<object>(
  "https://api.hotmobile.com.br/Sms/ConsultaSaldo"
);