Thanks for reaching out to the Community, krucki.

To turn on payment options for invoices that currently have them turned off, you'll need to edit each one manually, turn the appropriate payment method(s) on, then save your changes.

Here's how:

1. In the left navigation bar, go to Sales, then Invoices.
2. Find an invoice you want to edit.
3. Click its Pencil (✏️) icon.
4. Turn on the online payment option(s) you want them to have.
5. Make any other necessary changes.
6. Select Save and close.

Afterwards, you can resend them to customers so they'll see their option(s) to pay online.

You'll also be able to find many detailed resources about using QuickBooks in our help article archives.

Please don't hesitate to send a reply if there's any additional questions. Have a lovely day!