You won’t be able to use Internet Explorer for Windows XP to access the Merchant Service Center after May 31, 2017. The good news is that any other browser (like Google Chrome) works just fine
 
Welcome to the merchant service center
The gateway to your QuickBooks Payments Account
  • Process and manage one-time and recurring payments
  • Track your deposits, fees and statements
  • Manage services like Mobile Payments and Web Payments
  • Update your account information, find Help and more
Not a customer yet? Find out how you can start getting paid faster with Intuit QuickBooks Payments.