Is there any way to add my customer's email address to the invoice. I can add the customer field but don't know how to pull through the email address.

Welcome, @theflatpack!

Once you've added an email to your customer's profile, it'll automatically show in the Customer email field. But if you wish to show your customer's email address in the content of your invoice, you can use the custom field. To do so:

1. Go to the Gear icon.
2. Under Your Company, select Custom Form Styles.
3. Find your invoice template in the list.
4. Under ACTION, select Edit.
5. Tap Content.
6. On the Header section, tap Custom field.
7. Enter Customer Email as the custom field name.
8. Click Done.

Here's an article you can read to learn more about how you can customise your invoice template: Customise your invoices, estimates, and sales receipts in QuickBooks Online.

I've got you this helpful article that'll guide you in recording payments from your customers: Record invoice payments in QuickBooks Online.

If there's anything else that I can help you with, please let me know in the comment down below. I'll be always around ready to help.