Totally baffled on web site error ...

[RCPWISC]

Hi everyone:  I'm relatively new to Linux Lite, but what I'm experiencing has me completely baffled.  We recently got set up with a POS software program (run via a web site) that allows us to process credit cards.  I had an old HP pc laying around, and thought this would be a perfect use for it, as it would only be used for this sole purpose.  I installed the OS, loaded up the web site in Firefox, and when I get to the point to submit the transaction for processing, the web server responds with an error.  It's not a standard error or a browser error - it's an error generated by the POS web server stating it cannot process the transaction, and it instructs me to refresh the browser.  I do that, and it's an endless circle.

I tried the POS web service with Firefox, Chromium and Google Chrome, and all three refused to process the transaction.  For grins, I tried processing on my Windows PC using Google Chrome, and it went through without an issue.

What am I missing here?  A web browser is a web browser ... what would make this work on a Windows browser, but not work on a Linux browser?  I'm totally at a loss ......

Thanks for any light you can shed on the subject!

-M