Brian, FYI: we are trying this with a sandbox account. Is that the
issue? I am not sure how Auth.net routes requests through the back end,
but I wonder if perhaps a different server is handling the request when
a sandbox account is referenced? Thanks...
I am having this same issue. I decided to install the accept-sample-app
from the Authorize.net github project, and it has the same issue:
XMLHttpRequest cannot load
https://jstest.authorize.net/v1/AcceptCore.js. No
'Access-Control-Allow-Origin' heade...
