Get_Posts() with numberposts set to -1

Hello,

Description of issue

In the method ShareASale_WC_Tracker_Pixel::get_customer_status() there is a call to get_posts() that has numberposts set to -1. On sites with over a million orders this is a very expensive query. Since this method is hooked into woocommerce_thankyou it can cause the WooCommerce Order Completed page to take 10+ seconds to render.

Possible fixes

1. It would be helpful for sites that do not want run this expensive query to have a setting to turn it off.

2. Replace the expensive query with another method like adding a user meta of “total orders” that can be updates after an order is placed.

Thanks.