Good day, @sdtrashvalet. You can find the ACH authorization form by logging in to your Payments account or creating a sales receipt and selecting ACH as a payment method. Allow me to share the full details below.
You can follow these steps if you go to your Merchant Services account:
- Go to the Processing Tools section.
- Pick Accept and eCheck.

- Enter all the information required.
- Choose if you have a signed authorization or the customer is on the phone.

- Select a box to validate you've received signed/verbal authorization from your customer that they consent. Check out this eCheck authorization form your clients need to sign and return to you.
- Once done, click Submit to process the transaction.
What's more, you can also locate the form when creating a Sales Receipt transaction. Here's how:
- Click the + New tab. Select Sales Receipt from the Customers column.
- Enter the customer name and other necessary information to process the payment.
- Go to the Payment method section and pick ACH.
- Choose Enter bank info.

- Fill in the needed details and tick the box My customer signed the authorization form or I read the authorization script to them. You can visit the highlighted phrase to access what you want.

- Once done, you can Save this account for later and Submit it.
You might also find this article helpful when it comes to processing ACH payments: Common questions about QuickBooks Payments deposits in QuickBooks Online.
The Community will always have your back if you need a hand with managing your customer payments. If you have other questions, feel free to add them below. Have a good one.