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	public function gens_send_email($user_id,$coupon_code) {

		if ( !$user_id || !$coupon_code) {
			return false;
		}

		global $woocommerce;
		$mailer = $woocommerce->mailer();

		$user_info = get_userdata($user_id);

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<?php
/**
 * Product loop sale flash
 *
 * @author 	Vivek R @ WPSTuffs.com
 * @package 	WooCommerce/Templates
 * @version     1.6.4
 */

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

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/**
 * Add custom sorting options (asc/desc)
 */
add_filter( 'woocommerce_get_catalog_ordering_args', 'custom_woocommerce_get_catalog_ordering_args' );
function custom_woocommerce_get_catalog_ordering_args( $args ) {
  $orderby_value = isset( $_GET['orderby'] ) ? wc_clean( $_GET['orderby'] ) : apply_filters( 'woocommerce_default_catalog_orderby', get_option( 'woocommerce_default_catalog_orderby' ) );
	if ( 'random_list' == $orderby_value ) {
		$args['orderby'] = 'rand';
		$args['order'] = '';
		$args['meta_key'] = '';

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// ref. https://jeroensormani.com/ultimate-guide-to-woocommerce-checkout-fields/
//This post is meant as a one stop shop if you’d like to make any kind of customizations to your WooCommerce checkout fields. Whether this is adding additional fields, removing some unneeded ones or changing the order they’re displayed in. 
This post is meant as a one stop shop if you’d like to make any kind of customizations to your WooCommerce checkout fields. Whether this is adding additional fields, removing some unneeded ones or changing the order they’re displayed in.

Additionally there will be guides on how do display fields two field side by side, updates the order totals when a field changes and how to add basic field validation.

This is a post with a lot of code snippets and likely requires changes for it to fit your exact needs. Prefer to use a plugin instead? Take a look at my Advanced Checkout Fields for WooCommerce plugin.
Good to Know

These are some good to know files, hooks and functions/methods. Some of these 

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