Adds a meta field for wc_coupon and syncs the most recently used coupon to the contact record on checkout

wpf-sync-woocommerce-coupon.php

<?php 

/*
Plugin Name: WP Fusion - WooCommerce Coupon Sync
Description: Syncs a coupon used at checkout to a custom field on the contact record
Plugin URI: https://verygoodplugins.com/
Version: 1.0
Author: Very Good Plugins
Author URI: https://verygoodplugins.com/
*/

function wpf_coupon_meta_fields( $fields ) {

	$fields['wc_coupon']	= array( 'label' => 'Coupon', 'type' => 'text', 'group' => 'woocommerce' );
	return $fields;

}

add_filter( 'wpf_meta_fields', 'wpf_coupon_meta_fields' );

function wpf_sync_coupon( $order_id, $contact_id ) {

	$order = wc_get_order( $order_id );
	$coupons = $order->get_used_coupons();

	if( ! empty( $coupons ) ) {

		$code = $coupons[0];

		wp_fusion()->crm->update_contact( $contact_id, array( 'wc_coupon' => $code ) );

	}

}

add_action( 'wpf_woocommerce_payment_complete', 'wpf_sync_coupon', 10, 2 );