How can I add "check" to payment methods on an invoice?

We are grateful for your participation in the Community forum, @Timothy B.

I want to take this opportunity to provide specific details about adding a method of handling invoice payments.

In QBO, we can use the Custom fields feature to your form so you can add Check as a payment option. Here's how: 

1. Go to the Gear icon and choose Custom Fields from the All lists section.
2. From there, click Add Field.
3. Enter a name in the Name field (Payment Method).
4. Tick the All sales forms or Invoice checkbox.
5. You can turn on the Print on form to show it on the printed and delivered form.
6. Hit Save once done.

Alternatively, if you have set up QuickBooks Payments, you can change it directly on your new or existing invoices. I'll show you how to do it:

1. Go to the Invoices menu, choose a transaction you want to update, then click Edit in the Online payments section.
2. Choose the payment options you want.
3. Click OK and hit Save or Save and close once done.

This article can give you more information on accepting electronic payments for online invoices and in-person sales: Take and process payments in QuickBooks Online with QuickBooks Payments.

Also, check out this article to learn more about using your payments account in QuickBooks: How to set up QuickBooks Payments.

Please comment below if you still have more queries about accounting customer payments in QuickBooks Online. We're always here to help you in any way we can. Take care always.