Why does the app close down when I try to input payment for a invoice I'm trying to send?

Hi there, @niabignell-btint.

I'm here to ensure you can save the invoice when inputting a payment in QuickBooks Online (QBO).

To start, I'd like to verify what specific app you're using. Is it a mobile app or a desktop app? Did you receive an error message when the app close? Any additional information is appreciated.

In the meantime, let's perform some troubleshooting to isolate the issue by refreshing your QuickBooks app to clear the cache and resolve any performance while using it. 

If you're using the QBO desktop app, here's what you'll need to do:

1. Navigate to the Help menu. 
2. Select Reset App Data. 
3. Once done, close and re-open the app.

If you're using the mobile app, you'll want to clear the mobile app's data. This way, you can access the app with a clean slate and proceed to manage your transaction receipts.

For Android users, here's how:

1. On your phone, go to Settings.
2. Select the QuickBooks Online application.
3. Click the Refresh Data, and then choose Yes.

For iOS users, these are the steps:

1. Select the Menu icon at the top right.
2. Then, choose Help & Feedback. 
3. Next, click Refresh Data and Refresh. 

Once done, try to input payment and save invoices. If the issue persists, you can uninstall and reinstall the app. Also, please ensure you're running the latest version. 

Additionally, I'm attaching our Community link in case you need help adding, organizing, and sending invoices: Sales and customers.

If you have any other concerns about managing your account, let me know by commenting below. I'm here to lend a hand. Have a good day!