<?php
function theme_top_bar( $wp_customize ) {
  $wp_customize->add_section( 'topbar_section', array(
    'title' => 'topbar',
    'priority' => 211,
  ));

  $wp_customize->add_setting( 'checkbox_sample', array(
        'default'  => false,
        'sanitize_callback' => 'theme_slug_sanitize_checkbox',
    ));
    $wp_customize->add_control( 'checkbox_sample', array(
        'label'       => 'topbar_enable',
        'section'     => 'topbar_section',
        'priority'    => 1,
        'type'        => 'checkbox',
    ));

// tell phone
  $wp_customize->add_setting( 'tell', array(
    'type' => 'option',
    'sanitize_callback' => 'wp_filter_post_kses',
  ));
  $wp_customize->add_control( 'tell', array(
    'settings' => 'tell',
    'label' => 'Phone number',
    'section' => 'topbar_section',
    'type' => 'text',
  ));

// contact URL
  $wp_customize->add_setting( 'contact', array(
    'type' => 'option',
    'sanitize_callback' => 'wp_filter_post_kses',
  ));
  $wp_customize->add_control( 'contact', array(
    'settings' => 'contact',
    'label' => 'Conract URL',
    'section' => 'topbar_section',
    'type' => 'text',
  ));

// access
  $wp_customize->add_setting('access', array(
    'type' => 'option',
    'sanitize_callback' => 'wp_filter_post_kses',
  ));
  $wp_customize->add_control( 'access', array(
    'settings' => 'access',
    'label' => 'Access',
    'section' => 'topbar_section',
    'type' => 'text',
  ));
}
add_action( 'customize_register', 'theme_top_bar' );