I'v run into a sudden issue with CartThrob and PayPal Express in which it is giving me the following short error message:
error 10004: Transaction refused because of an invalid argument. See additional error messages for details.
Unfortunately, I'm having a hard time troubleshooting this issue because error 10004 can have a multitude of reasons for showing up but I can't find the specific issue without seeing the "long" error message. Is there a way to see the "long" error message with CartThrob natively? Or barring that, some way to see it through the PayPal developer site side?