Desktop 2024 Enterprise-

I can provide several troubleshooting steps to allow you to sign up for QuickBooks Payments, @Mtsnowfire.

Since QuickBooks payments sign-up in QuickBooks Desktop (QBDT) uses Internet Explorer behind the scenes, we can clear the cookies and cache in this browser to fix the internet connection error you've encountered. I can guide you through the steps.

If you're using Windows 10, you can follow these steps:

1. Open Internet Explorer.
2. Select the Tools ⚙ icon. Or, press the Alt key on your computer to bring up the menu bar, then select the Tools menu.
3. Select Internet Options from the menu.
4. Go to the General tab. From the Browsing history, select Delete…
5. Select the following to delete:
   • Temporary Internet files and website files
   • Cookies and website data
   • History
   • Passwords
6. Select Delete.
7. Close the Internet Options window.
8. Close Internet Explorer.
9. Sign up for QuickBooks Payments again within QBDT.

If you don't see Internet Explorer on your computer, we can clear the cookies and cache in the Microsoft Edge browser instead. Here's how:

1. Open Microsoft Edge.
2. Select the button with three dots (...) at the top right of the browser window.
3. Select Open with Internet Explorer.
4. Follow the steps above to clear the cookies and cache.

For the rest of the troubleshooting process, refer to this article: Fix internet connection problems in QuickBooks Payments.

Alternatively, you can consider signing up for QuickBooks Payments through your web browser and link your Payments account to your QBDT once done.

For future reference, I'm adding this guide about processing payments once QuickBooks Payments in your QBDT is turned on: Take and process payments in QuickBooks Desktop.

We'll be here in the Community if you have further concerns about signing up for QuickBooks Payments in QBDT. We'll do our best to assist.

@Mtsnowfire  

You can consider to use a 3rd party payment processor as another option. Are you B2B or B2C?