I downloaded InvoiceMakerReceiptSpark to be able to issue invoices/receipts when I sell items online. However, I have found InvoiceMakerReceiptSpark to be somewhat quirky, not very user-friendly, has no documentation of how to use it, and requires odd data for certain things. For instance, I can create items for sale easily enough, and I can attach those to an invoice easy enough, as well as create a client just fine, but then it requires an email address and phone number for all clients; most strangers from the internet are not going to divulge this info, nor am I comfortable asking for it, and finally, it has a place for payment methods, which is just a text box, with no description of what is supposed to go here. Additionally, once I create an invoice, I can email it, print, or save it easy enough, but I have found literally no way to mark an invoice as PAID, so everything just winds up showing as overdue. I’m rather disappointed in InvoiceMakerReceiptSpark , because it does look nice and clean, but if I can’t mark things as paid, then what’s the point?