I am trying to set up a new authorizenet provider. I am super experienced with the payflow gateway...but cant seem to get auth working with the dev gateway.

can someone give me the smallest working string they know that WORKS?

I keep getting an error of 
DataSprings.Modules.DynamicRegistration.DynamicRegistration.ProcessAuthorizenet

 DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DataSprings.Modules.DynamicRegistration.DynamicRegistration.ProcessAuthorizenet(String url, String strPost)