How to add bank payment details to the invoice to send to customers

That's easy to add in your invoice template, denglhs.

Let me show you how to add payment details that your customers will use as reference in paying the invoice:

1. Go to the Gear icon and select Custom form styles.
2. Just click the invoice template if you have an existing one or click New style > Invoice at the upper-right.
3. Select the Content tab.
4. Click the footer section of the template.
5. Enter your bank details under the Your payment details section.
6. Click Done.

If you want to set this template as the default to all invoices, click the drop-down arrow under the ACTION column of the template and select Make default. 

You'll want to check out these articles that will help you in handling customer payments and customizing sales form templates. 

Keep me posted if there's anything else that you need help with. Take care and enjoy the rest of the day!