Here is what I want to do. I am setting up a new commerce website for myself using WooCommerce. From each sale I will be donating $5 to a charity. In the header of my WordPress site I want to have a counter that shows how much money we have donated in this current week.
So how do I get the required number from the WP database? I guess I need to some how extract the number of sales from the database, multiply that by 5 and put it in the header.php with a $ infront of it.
I don’t mind if I have to change code at the beginning of each week to reset the counter.
Simple solution store a value of number of sales, create a wordpress option and increment it in the process of making the sale.
Otherwise you need to look more into the db structure of your ecommerce code and perform a count query of all records between today – 7d and today.