Bookly Invoices add-on allows you to automatically issue invoices to your clients upon ordered appointments.
Demo: https://codecanyon.net/item/bookly-invoices-addon/21841856
There's a reason Sprout Invoices is the best rated invoicing plugin for WordPress - it's the most fully featured Invoicing solution for WordPress with the highest regarded support available.
Demo: https://sproutinvoices.com
Your customers need PDF invoices - sometimes it’s required by law, sometimes it’s easier for them to upload PDFs into their booking system.
Demo: https://codecanyon.net/item/woocommerce-pdf-invoices/22847240
This is the Invoice-SaaS system where multiple companies can do registration and each company will have their separate user panel.
Demo: https://codecanyon.net/item/laravel-invoicessaas-management-system-saas-invoice-billing-management/37270828
The goal of InfyCRM is to manage & digitize the relationship of your customers with your business. InfyCRM is a perfect solution to manage your Customers, Contracts, Projects, Products, Leads, Invoices, and much more.
Demo: https://codecanyon.net/item/infycrm-laravel-crm-with-project-management-tasks-leads-invoices-estimates-and-goals/29902954
This extension will automatically attach a PDF copy of your invoice to your completed order email. Customers can sign in to their account and upload previous invoices, while administrators can resubmit the PDF or download a copy.