We can't list specific third-party apps for QuickBooks Online (QBO), but you can find various payment processors in our app store, @LaPosta.
You can explore the app menu for more options that suit your needs. When you connect apps to QuickBooks, you can manage each task efficiently, allowing data to synchronize accordingly.
Here's how:
- Navigate to the Apps menu.
- Choose the Find Apps.
- Click on the Search bar to find various payment processors.

Also, I'm adding this article for you to learn how to record third-party sales and fees for your online sales: Record third-party sales and fees.
If you have further questions about third-party apps or QBO payments-related concerns, just hit the Reply button below.