The link is a valid QuickBooks site. Though, we don't have a free version, but you can sign up for a 30 day free trial.
You can also contact our Customer Care Support to assist you further. The number is found on our website: https://quickbooks.intuit.com/.
This article is also a good reference: https://quickbooks.intuit.com/tutorials/lessons/how-to-set-up-and-use-quickbooks-payments/.
Feel free to swing by anytime if you have more questions. I'm always here to help.