How to provide invoice of the order to the customer?

Here are the most common ways to send an invoice:
Mail. If your client doesn’t use email or online invoicing, take a printout of your invoice and send it in the mail. It is a slow process but this is something you should have considered before starting the project.
Email. This is the most popular and quickest way to send an invoice. If you have created the invoice in a word processor or designing software, convert it into a PDF for enhanced security. Mention that you are sending an invoice in the subject line and write a short message in the body.

You can print an invoice for your order in Your Account as soon as your order is shipped.
First Go to Your Orders then Select Invoice underneath the order number and then Select Print this page for your records on the top of the order summary and then Select your browser’s print button.

there is a way you can send the invoice through email if the customer hasn’t protected the profile
if he has protected the profile, then you can go to inbox section of the profile of customer to attach that document.

You can use mail to provide an invoice, take a printout of your invoice and mail it to your client. It’ll take some time, but your invoice issue will be solved.

After your order has been sent, you can print an invoice for it in Your Account.

You can print an invoice from the order details and share it with the buyer.

Simply print the invoice from the details of order and send it to your customer via email.

Hey Jecob, I am agreed with Jason and William to first get the email of the customer through the message section and then click to print the download the invoice of the customer and then send it to your customer through the email.