I am trying to add Gocardless into QB.When it starts the connection it asks for the Sanbox or Prod URL. Where do I find this information?

Hi, NeilC1.

You've come to the right place for help with QuickBooks. Let's get your GoCardless added into QuickBooks Online.

When adding GoCardless into QuickBooks, this should not ask for Sandbox or Prod URL. Let's run some basic troubleshooting steps to isolate the problem. We can start by accessing QuickBooks Online in a private browser. This usually resolves any browser-related issues.

Here's how to open a private window in different browsers:

• Google Chrome: press Ctrl + Shift + N.
• Mozilla Firefox: press Ctrl + Shift + P.
• Internet Explorer: press Ctrl + Shift + P.
• Safari: press Command + Shift + N.

After that, let's try to add your GoCardless again by following the steps below.

1. Select Get app now.
2. On the authorisation page, choose Connect.
3. Enter the credentials for your GoCardless account, then select Connect account.

For detailed steps and instruction, check out this recommended article: GoCardless Welcome Guide.

Also, you may find this article helpful: 

https://quickbooks.intuit.com/community/Getting-Started/How-do-I-clear-my-browser-cache-and-temporary-Internet-files/m-p/186420.

For additional help, feel free to reach out to our QuickBooks Online Support.

Keep me posted if anything may arise while adding your GoCardless. I'll be right here to lend you a hand.