Okay, so I need some help with a current project. I created an eCommerce site for a friend of mine that owns a printer leasing company. Everything is done except a specific type of billing he requires. His customers pay him every month based on the quantity of copies they make per month. What I need to accomplish: A place for customers to input the number of copies they've made that both, both color and Black&White A way to automatically email customers every month, reminding them to go to the website to input their updated copy amount A way to send invoices to the customers every month after they submitted how many copies of each they've made Essentially I'm trying to create a fully automated system that the customer will input how many copies they've made, they'll receive an invoice of the amount due. (Payment is done offline, but I'd love to leave the option for online payment there) I know it's a bit complicated, so far I've got the YITH pdf invoice plugin that generates a pdf invoice for the customer when we manually go in and create the order. I've also set up 2 products: Black&White Copy and Color copy, each with their own price. Any advice for me guys? I'm really just looking for any tips you might have, specific plugins that I might be able to achieve this with. Thanks in advance!