I am having trouble using the sandbox environment right now. If I use the production environment my code works perfectly. If I use the sandbox, nothing is returned. I've double-checked my authentication multiple times, even reset the transaction key but nothing works. I don't even get an error if I send it a fake transaction key.
I am using the following endpoint for testing: https://apitest.authorize.net/xml/v1/request.api
I'm specifically attempting functions related to the CIM.