I am trying to sync my payment processor app (Helcim) but when I click Launch the page that opens is just an error..

Hi patiofurniturewa,

Welcome to Community!  I can understand the importance for you to integrate Helcim with QuickBooks Online.  Based on the details you've provided, I suggest launching the app using a private/incognito browser as it helps to bypass most browser issues. If you still get an error message, I highly recommend contacting the Helcim support team so they can investigate the issue and get you back on track as soon as possible.

If you have any other questions, please reach back out.  We'd be happy to help!