You can go to the Invoice page to send a paid bill or an invoice to your customer, Gokan.
 
Here's how:
 
- Click Sales on the left menu and choose Invoices.
 
- Locate the invoice you want to send. The status will display as Paid in the Status column.
 
- In the Actions column, click the drop-down menu and select Send.

 
- Enter the customer's email address in the To field.
 
- In the Email body, you can change the message and enter what you prefer to say to your customer. 
 
- Once done, select Send. 

 
 
Please let us know in the comment section below if you have follow-up questions.