The best way to send an invoice depends on your industry and the products and/or services you sell. Often, if you sell a product, you’ll send the invoice as soon as the purchase is made. If you sell a service, you may send the invoice after the services are completed. Alternatively, if it is a large order, you might break up the payment and send multiple invoices. You can send an invoice in a few different ways. You can email them a PDF or print the invoice for them. This can be done using one of our invoice templates. Alternatively, you can use Bookipi Invoice Generator to send e-invoices to your clients.