Good day, info895.
You can follow these steps to create a template for your invoice and update the email body:
- Go to the Gear > Custom Form Styles.
- Click the New style drop-down menu located in the upper right-hand corner.
- Select Invoice.
- In the Create invoices that turn heads and open wallets window, click the Emails tab.
- Enter the message and click Done after.
Once done, make sure to set the template as default. Please see this sample screenshot for reference:
I've got this article for more details: Customise your invoice emails.
If there's anything else you need, please let me know. I'm just a few clicks away to help you some more. Thanks.