Problem with returning info from paypal - 1.3.7 upgrade, express checkout

actually, mine was happening as a result of the global discount mod - I turned it off, and it works fine.

The errors I was getting were "cannot resend headers" and things of that nature that (apparently) the global discount mod was interfering with.

I'll try to re-setup the global mod, and see if it works on a fresh install.

Thanks for the update that your add-on was causing issues ...

If you turn on Debug Log to File in the PayPal Express Checkout module, it will store results of attempted transactions to your /includes/modules/payment/paypal/logs folder ( if it's writable ... otherwise it uses your /cache folder )

When you get errors like "(Transaction refused because of an invalid argument. See additional error messages for details.)" or "(Invalid HTTP Header)", it would be very helpful to be able to see these logs.

There are often 3 files with similar filenames but with some random 5-char extensions on them to prevent snoopers from being able to find and grab these files for inappropriate means. Please share the contents of all similarly-named files for analysis. You may obfuscate some data for privacy purposes, but please change as little as possible.