I'm trying to resolve a transaction by matching a invoice and then resolving the remainder, but at the top its saying that it doesn't match and to resolve the difference.

Hi there, @danielle24.

Thanks for reaching out to us. I'm here to help ensure to fix the difference so you can match the invoice successfully. 

When matching invoice transactions, you'll need to use the Resolve Difference button. This will helps match your transactions by resolving its difference until it will be equal to zero.

Let me walk you through the steps:

1. On the Banking page, select the For Review tab.
2. Select the transaction to open it.
3. Select the Find other records or Find match button to open the Match transactions window.
4. By default, the Match transactions window lists All transactions within the date range, but you can narrow the results.
5. Use options on the Show drop-down menu to specify the type of transaction you're looking for.
6. If the transaction you're looking for is outside the default date range, select the From and To date fields to change the dates.
7. If the amounts are different, you can locate additional matched transactions, or select Resolve Difference to open the Add resolving transactions fields to add the Category and Amount (and, optionally, Payee) of a resolving transaction until the difference equals zero.
8. If necessary, you can use the Add new transaction button to add multiple resolving transactions.
9. Select Save.

For additional reference, you can check these articles: Add and match downloaded banking transactions.

If you need further assistance with the steps, I recommend contacting our QuickBooks Online Support Team. They have additional tools to pull up your account and do a remote session. 

Here's how you can contact our customer support:

1. Sign in to your QuickBooks Online company.
2. Select Help (question mark icon) at the top right.
3. Click Contact us to connect with a live support agent.

This will get you on the right track. Don't hesitate to click the Reply button below if you have additional questions about matching transaction. I'll be around to help.