WP Customizer example 2

$wp_customize->add_section( 'your_section_name', array(
  'title' => __( 'Section Name', 'textdomain' ),
  'description' => __( 'Section Description', 'textdomain' )
) );

$wp_customize->add_setting( 'your_setting_name', array(
  'default' => 'latest',
  'sanitize_callback' => 'sanitize_text_field',
  'transport' => 'postMessage',
) );

$wp_customize->add_control( 'your_setting_name', array(
  'label' => __( 'Setting Name', 'textdomain' ),
  'description' => __( 'Setting Description / Control Instructions', 'textdomain' ),
  'section' => 'your_section_name',
  'type' => 'radio',
  'choices' => array(
     'value1' => __( 'Label 1', 'textdomain' ),
     'value2' => __( 'Label 2', 'textdomain' ),
  ),
) );