Hi there! If you're receiving this email it's because you're using Authorize.Net as your billing solution and you've witnessed this error message in CheddarGetter when trying to refund an invoice:

401: (2003) The gateway has denied access

That's simple enough to fix if you haven't done so already. You'll just need to make a quick change in your merchant interface. That process is documented here.

As always, please let us know if we can help!