When sending a invoice to a customer, they have the ability to change the total balance and enter any amount. How do I disable this feature. I don't want them to edit it.

I'm glad to see you in the Community today, toves-peter.

Money is crucial for maintaining a seamless business operation. I'm here to assist you in finding an alternative solution to enable your customer to pay the invoice in full.

As of the moment, the ability to turn off the Edit amount function for electronic invoices is unavailable. On the other hand, utilize the Payment Links feature to get paid without even sending the sales entry. It's important to know that it's not used to collect payment for open or overdue invoices.

 Aside from that, keep in mind the following:
 

• Payment links can't follow up on a payment for an invoice previously sent.
• Payments made through payment links show as sales receipts.
  
  

When you're ready, let's proceed and send the link to your customer. Here's how:

1. In your company, head to the Sales menu on the left panel and choose Payment links. 
2. Click the Get started button and select Create a link. 
3. This action will open a window that lets you choose One-time payment link (Works once and expires after it’s used) or Multi-use payment link (Works with multiple customers and can be used multiple times).
4. Enter the following information:
   
   • Amount
   • Description
   • Select existing customer name or add a new customer
   • Customer email
   • Select payment method i.e. credit card or ACH.
5. Press the Create a link button. 
   
   

Next, copy the link and paste it into an email to your customer, or select the QR Code to have your client scan it to pay in front of you. Also, you can post a multi-use link to Facebook or Twitter.

When the link is clicked by your client, they will be required to input their payment details. Once the transaction is sent, you will receive a confirmation email that includes the Payment links.

Check out this article to visually guide you through the process: How to use payment links in QuickBooks Online,

In QuickBooks Online (QBO), manually record the payment to the invoice to balance your account. I've gathered various resources that address different aspects of payment management, handling customer transactions, and other sales-related activities. Take a look at each article to find more detailed insights:
 

• Take and process payments in QuickBooks Online with QuickBooks Payments
• Invoices and payments
• Topics about your company's income and customers
  
  

Keep in touch if you have additional questions about utilizing the Payment Links feature or need further assistance processing customer payments. I'll get back to make sure everything is taken care of for you. Have a good one, toves-peter.