zensend verify step 1

login.php

<?php
$verify = new ZenSend\Verify(API_KEY);

$username = $_POST["username"];
$user = USERS[$username];

if ($user && $user["password"] == $_POST["password"]) {
  session_start();
  $_SESSION["username"] = $username;
  $options = new ZenSend\VerifyOptions();
  $options->message = "{{token}} is your COMPANY verification code";
  $options->originator = "YOURCOMPANY";
  $verify->create_session($user["msisdn"], $options);
  header("Location: /msisdn_verify.php");
} else {
  $error = "Invalid username or password";
  require 'login_form.inc';
  return;
}
?>