woocommerce: add terms & conditions

functions.php

/**
 * Add Terms and Conditions field to the checkout
 **/
add_action('woocommerce_after_order_notes', 'my_custom_checkout_field');
 
function my_custom_checkout_field( $checkout ) {
 
    echo '<div id="terms_conditions"><h3>'.__('Terms and Conditions: ').'<a href="http://sylvanbotanical.org/fiveflavorsherbs/about/terms-and-conditions/">view here</a></h3>';
 
    woocommerce_form_field( 'terms_conditions', array(
        'type'          => 'checkbox',
        'class'         => array('input-checkbox'),
        'label'         => __('I have read and agreed.'),
	'required'  => true,
        ), $checkout->get_value( 'terms_conditions' ));
 
    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['terms_conditions'])
         $woocommerce->add_error( __('Please agree to terms and conditions.') );
}

/**
 * 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['terms_conditions']) update_post_meta( $order_id, 'Terms and Conditions', esc_attr($_POST['terms_conditions']));
}