Thanks for getting in touch with the Community, parkerupllc.
 

You can turn off ACH transactions in your Account and Settings.
 

Here's how:

1. Use the Gear (⚙️) icon, then choose Account and settings.
2. Access your Sales tab.
3. In the Invoice payments section, click your Pencil (✏️) icon.
4. Untick the Accept ACH checkbox.
5. Select Save.
   

You can also edit these options on the invoice screen itself, when emailing them out to customers.

If you'd prefer to disconnect your payment processing account from QuickBooks and close it, you'll want to get in touch with our Customer Care team. They'll be able to pull up the account in a secure environment and assist you with what you're looking to do.
 

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