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Add the field to the checkout

/**

Add the field to the checkout
**/
add_action('woocommerce_before_order_notes', 'my_custom_checkout_field');

function my_custom_checkout_field( $checkout ) {

echo '<div id="my_custom_checkout_field"><h3>'.__('Como nos conheceu?').'</h3>';

woocommerce_form_field( 'my_field_name', array(
    'type'          => 'select',
    'class'         => array('my-field-class form-row-wide'),
'required'      => true,
    'label'         => __('Escolha uma opção'),
    'placeholder'       => __('Enter something'),
'options'     => array(
    '' => __(''),
    'pelo Google' => __('OPÇÃO 01', 'woocommerce' ),
    'pelo Facebook' => __('OPÇÃO 02', 'woocommerce' ),
    'pelo blog Site da Mamãe' => __('OPÇÃO 03', 'woocommerce' ),
    'por indicação' => __('OPÇÃO 04', 'woocommerce' )
    )
    ), $checkout->get_value( 'my_field_name' ));

echo '</div>';

}

/**

Process the checkout
**/
add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');

function my_custom_checkout_field_process() {
global $woocommerce;

// Check if set, if its not set add an error.
if (!$_POST['my_field_name'])
     $woocommerce->add_error( __('Please enter something into this new shiny field.') );

}

/**

Update the order meta with field value
**/
add_action('woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta');

function my_custom_checkout_field_update_order_meta( $order_id ) {
if ($_POST['my_field_name']) update_post_meta( $order_id, 'Como nos conheceu?', esc_attr($_POST['my_field_name']));
}

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