Lessons Invoicing gives you more time to do what you love.Track lessons and invoice clients more quickly and efficiently than ever before. Specifically designed for individual instructors and coaches, Lessons accurately generates invoices and emails them directly from your phone.Lessons Invoicing is designed to get out of your way, so you can focus on what you love to do. In a matter of seconds, you can enter a new lesson or invoice item. The rest is handled by the app.