Customizing the text of your invoice message template is easy!
FROM THE WEB APP
Step 1: Go to Settings > One-Off Emails.
Step 2: Scroll down to the "One-Off Email" area
Step 3: Click on the "Invoice Email" template.
FROM THE MOBILE APP
Editing message templates is only available in the web app at this time. We are working to add this functionality to the mobile app.