Trying to configure the paypalcheckout plugin

-- HikaShop version -- : 4.7.5
-- Joomla version -- : 4.3.4
-- PHP version -- : 8.1.22
-- Browser(s) name and version -- : Chrome
-- Error-message(debug-mod must be tuned on) -- : Client Authentication Failed

When saving the configured plugin, I get "Client Authentication Failed" I've checked and double checked the setting and I'm fairly confident they are correct. I've setup a few other sites and they aren't having a problem. Any thoughts as what could be happening here?

Hi,

I suppose you manually entered the information in the input fields. Make sure there are no spaces before / after each value in the inputs. Otherwise, you will get that issue.
Also, if you use sandbox credentials with the sandbox setting turned off, or live credentials with the sandbox setting turned on, you'll get that error.