We can the bank details by customising the form, alan-synopsis1-c.
Let me guide you with these steps:
- From the Gear icon, select Custom form styles.
- Locate the invoice template, and then click Edit.
- Go to the Content tab.
- Click the footer section.
- Add your bank information on the Your payment details field.
- Click Done.
I've also added this screenshot as your reference:
If you want to create your own invoice template, you can import a style. Here's an article for more information: Import Custom Form Styles For Invoices or Estimates.
I'll be around if there's anything that I can help. Have a good day!