It's good to have you here, Michael. Yes, saving payment details on invoices is simple with our Custom Form Style feature. Let me guide you through this process.
You can keep your customer's payment details under the Message on Invoice section or add them on the Footer of your sales form. To do these:
- In your QuickBooks Online account, go to Settings from the upper right section, then choose Custom Form Styles.
- You can modify the Standard template or click on the New Style icon.
- On the template's page, click on the Content tab and select the last part section of the invoice.
- Under the Message to Customer on dropdown, choose Invoices and Other Sales forms.
- Enter the payment details. Then, hit Done.
- Also, you may add their details under the footer section of the invoice.

Once done, choose the modified invoice template when creating customer sales transactions. Then, click on the Customise icon below and choose the specific form.

Additionally, you can start reviewing and recording customer-paid invoices to ensure accurate tracking in your account.
With the detailed information above, you can start tracking customer invoices with their specific payment details. Feel free to let us know if there's anything else you need further assistance with. Keep safe.