Integrate Contact Form 7 With 3rd Party(MSG91) In WordPress (http://sivasankar.in/integrate-contact-form-7-3rd-party-wordpress/)

function.php

<?php

/* Contact Form 7 - Hook For MSG91 */
function msg91_api($cf7) {
    $wpcf = WPCF7_ContactForm::get_current();
    if ($wpcf->id() == 4) {
        if (get_option('enable') == '1') {
            $authKey  = get_option('authKey');
            $mobiles  = get_option('mobiles');
            $senderId = get_option('senderId');
            $message  = urlencode($_POST['message']);
            $route    = 4;
            
            if (strlen($message) >= 160) {
                $message = substr($message, 0, 157) . '...';
            }
            
            $url  = "http://api.msg91.com/api/sendhttp.php";
            $body = array(
                'authkey' => $authKey,
                'mobiles' => $mobiles,
                'message' => $message,
                'sender' => $senderId,
                'route' => $route
            );
            
            $request = wp_remote_post($url, array('body' => $body));
        }
    }
    return $wpcf;
}
add_action('wpcf7_before_send_mail', 'msg91_api', 10, 4);
/* / Contact Form 7 - Hook For MSG91 */

/* WordPress Admin Panel Settings For MSG91 */
add_action('admin_menu', 'msg91_sms_menu');
function msg91_sms_menu() {
    //create new top-level menu
    add_menu_page('MSG91 - SMS service provider', 'MSG91', 'administrator', __FILE__, 'msg91_sms', 'dashicons-admin-comments');
    
    //call register settings function
    add_action('admin_init', 'msg91_plugin_settings');
}

function msg91_plugin_settings() {
    //register our settings
    register_setting('msg91-sms', 'enable');
    register_setting('msg91-sms', 'authkey');
    register_setting('msg91-sms', 'senderId');
    register_setting('msg91-sms', 'mobiles');
}

// html view for our settings
function msg91_sms() { ?>
   <div class="wrap">
    <h1>MSG91 - SMS service provider</h1>
    <form method="post" action="options.php">
    <?php settings_fields('msg91-sms'); ?>
    <?php do_settings_sections('msg91-sms'); ?>
       <table class="form-table">
            <tr valign="top">
              <th scope="row">Enable ?</th>
              <td>
                <select name="enable">
                <option value="1" <?php echo get_option('enable') == 1 ? "selected" : ""; ?> >Yes</option>
                <option value="0" <?php echo get_option('enable') == 0 ? "selected" : ""; ?> >No</option>
                </select>
              </td>
            </tr>
            <tr valign="top">
              <th scope="row">Authkey</th>
              <td><input type="text" name="authkey" value="<?php echo esc_attr(get_option('authkey')); ?>" /></td>
            </tr>
            <tr valign="top">
              <th scope="row">Sender ID</th>
              <td><input type="text" name="senderId" value="<?php echo esc_attr(get_option('senderId')); ?>" /></td>
            </tr>
            <tr valign="top">
              <th scope="row">Mobile Numbers</th>
              <td><input type="text" name="mobiles" value="<?php echo esc_attr(get_option('mobiles')); ?>" /></td>
            </tr>
        </table>
        <?php submit_button(); ?>
    </form>
    </div>
<?php
/* WordPress Admin Panel Settings For MSG91 */
}?>

it's not working...